Abstract

Highly ytterbium (Yb3+)-doped double-clad phosphate fiber was fabricated for the investigation of power scaling of a 976 nm single-frequency laser. Over 3 W single-frequency laser output power was obtained with gain fibers shorter than 10 cm. Our experimental results show that Yb3+-doped phosphate fiber is a promising gain medium for 976 nm laser amplifiers.

© 2017 Optical Society of America

1. Introduction

Single-frequency laser sources have attracted considerable attention since they have a wide range of applications, including coherent beam combining, high resolution sensing, optical frequency domain reflectometry, coherent LIDAR systems, optical parametric oscillators, gravitation-wave detection, and nonlinear frequency conversion [1–3]. Compared to other laser platforms, fiber lasers have the advantages of high power scalability, high beam quality, high heat dissipation capability, compactness, low manufacture and maintenance cost. Various single-frequency fiber lasers and amplifiers operating at different wavelengths have been developed for many applications mentioned above. In recent years, high power single-frequency fiber laser sources at 976 nm have garnered great interest because they can be used as low-noise pump sources for core-pumped ytterbium (Yb3+)- or erbium (Er3+)-doped lasers and amplifiers [4] and nonlinear frequency converters to generate coherent visible and UV radiation [5–8].

Light emission at 976 nm results from the zero-line transition from the lowest level of the 2F5/2 manifold to the lowest level of the ground 2F7/2 manifold of Yb3+ ions which can be excited by absorbing pump light at 915 nm. Nearly 100-W output power has already been achieved with Yb3+-doped rod-type photonic crystal fiber lasers [9, 10]. However, their output spectra are too broad for use in applications where narrow-linewidth lasers are required. Therefore, it is still of great interest to investigate single-frequency Yb3+-doped fiber lasers and amplifiers to understand the power scaling of narrow-linewidth lasers at 976 nm. Single-frequency laser light at 976 nm can be generated with distributed feedback (DFB) diode lasers [11, 12] and short cavity distributed Bragg reflector (DBR) Yb3+-doped fiber lasers [13, 14]. However, their output powers are on the order of several hundreds of milliwatts. Fiber amplifiers have to be employed to increase the output power so as to reach the requirements for many practical applications. In the last decade, several 9xx nm Yb3+-doped silica fiber amplifiers were demonstrated. In 2004, D. Soh et al. demonstrated ring-doped jacked air-clad Yb3+-doped fiber laser amplifiers at 977 nm and 978 nm with output powers of 4.3 W and 2.7 W, respectively [6, 15]. In 2010, J. Boullet et al. developed a millijoule-class pulsed fiber laser system operating at 977 nm based on a Q-switched fiber oscillator and an ultra-large core photonic crystal fiber amplifier. An average power of 78 W was obtained in the pulsed regime [16]. However, all of these Yb3+-doped silica fiber amplifiers were not demonstrated with single-frequency seed lasers. Furthermore, these complex fiber structures require special handling, making it hard to develop all-fiber compact laser systems.

So far, all of the watt-level 9xx nm Yb3+-doped fiber amplifiers have been developed based on silica host glass fibers. Due to poor solubility, silica glass exhibits deleterious effects of ion clustering, which can result in concentration quenching [17] and photodarkening [18], consequently impairing the efficiency and long-term performance of silica fiber lasers. Compared to silica, phosphate glass has much higher solubility for rare-earth ions and thus much lower ion clustering. Concentration quenching was not observed in Yb3+-doped phosphate glass with a concentration even as high as 18.9 wt% [19]. On the other hand, photodarkening in a phosphate fiber is also much less than in a silica fiber. It was found that Yb3+-doped phosphate fibers with concentrations 6 times greater than the most photodarkening-resistant silica fibers have comparable resistance to photodarkening [20]. Thus, highly Yb3+-doped phosphate fibers are promising gain media for high power laser at 976 nm.

Yb3+-doped phosphate fibers have been successfully used to achieve single-frequency lasers at 976 nm. The first 976 nm single-frequency DBR fiber laser [13] was developed with a 2-cm 6 wt% Yb3+-doped phosphate fiber. A 350 mW 976 nm core-pumped fiber amplifier was demonstrated with a gain fiber length of only 4 cm [21]. In order to further increase the 976 nm single-frequency laser output, cladding pumping with multimode diodes pumps has to be used because the available power of single-mode diode pump is limited to hundreds of milliwatts. In this paper, we report our experimental investigations into further power scaling of single-frequency lasers at 976 nm by using a Yb3+-doped double-clad phosphate fiber.

2. Yb3+-doped phosphate fiber

Phosphate glass, consisting of PO4 tetrahedral units with three bridging oxygen atoms and one doubly bonded oxygen, has lower strength than silica glass [22]. Phosphate glass has a relatively low glass transition temperature 400-700 °C and is easy to synthesize with a variety of compositions. The addition of modifying alkali or alkaline earth cations can depolymerize the phosphate network by converting the P = O bonds into bridging oxygens. Al2O3 can be incorporated into phosphate glass to ensure high mechanical strength and good chemical durability [19, 20, 24, 25]. Moreover, compared to silica glasses, the refractive indices of phosphate glasses can be easily adjusted [26], which is helpful for obtaining a much smaller numerical aperture (NA) for the fiber core, enabling single mode operation with larger core size.

The phosphate glasses for fiber fabrication were manufactured with conventional glass melting method. Firstly, high purity raw materials were weighed and mixed. Then they were melted in a crucible at temperature of 1150 - 1500°C, depending on the glass compositions. The glass melt was bubbled with oxygen and stirred simultaneously to achieve high homogeneity. After dehydration and clarification, the melt was casted in a preheated metal mold. Finally, the glass was annealed in an oven at glass transition temperature and cooled slowly to room temperature at a rate of 0.5 °C/min. The phosphate fiber used in our experiment was manufactured at NP Photonics, by the rod-in-tube technique. As shown in Fig. 1(a), the Yb3+-doped double-clad phosphate fiber has a core diameter of 18-μm and numerical aperture (NA) of 0.04 that supports only the fundamental transverse mode at 976 nm. The inner circular cladding has a diameter of 135 μm and a NA of 0.45. The outer cladding is also made of phosphate glass and its diameter is 150 μm. The core was uniformly doped with 6.69 × 1026 m−3 (6 wt%) of Yb3+ ions.

 figure: Fig. 1

Fig. 1 (a) The end-face of the Yb3+-doped double-clad phosphate fiber; absorption and emission cross-sections of Yb3+ ions in (b) phosphate and (c) silica glasses [27].

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The absorption and emission cross-sections of our Yb3+-doped phosphate glass were measured and shown in Fig. 1(b). The silica glass [27] exhibit different features as shown in Fig. 1(c); this is attributed to the differences between the phosphate and silica glass matrices. Both the absorption and emission peaks of the Yb3+-doped phosphate glass are located at 976 nm, while the corresponding values for silica glass are at 977 nm. As a consequence, the amplified spontaneous emission (ASE) of Yb3+-doped phosphate fiber and silica fiber are also different. Figure 2 shows the ASE spectra of a 24.5-cm long Yb3+-doped silica fiber (Nufern PM-YDF-5/130-VIII) and a 5-cm long Yb3+-doped phosphate fiber pumped with a single-mode 915 nm diode laser. To ensure that the silica fiber absorbs the same pump power as the phosphate fiber, a long piece silica fiber was cut so that the residual pump power equaled to that of phosphate fiber. Both of the launched pump powers were 150 mW and the residual pump powers were ~5.68 mW. The output spectrum of the silica fiber has a primary peak at 977.46 nm and a secondary maximum at 1027 nm. However, the phosphate fiber shows a primary peak at 975.96 nm and a secondary maximum at 1006.44 nm. All of these features indicate that Yb3+-doped phosphate fiber is more suitable than silica fiber for short-wavelength laser emission.

 figure: Fig. 2

Fig. 2 ASE spectra of Yb3+-doped silica and phosphate fibers (resolution: 0.1 nm).

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3. Cladding-pumped single frequency fiber amplifiers

The 18-µm core Yb3+-doped phosphate double-clad fiber was investigated for power scaling of the single-frequency laser at 976 nm using an experimental setup as depicted in Fig. 3. A 200 mW 976.9 nm single frequency DFB diode laser (LU0976M200, linewidth < 10 MHz) was used as the seed laser. A polarization maintaining (PM) fiber isolator and a 976/1030 nm PM wavelength-division multiplexing (WDM) were used to protect the seed laser by blocking the backward amplified spontaneous emission (ASE) and possible parasitic laser emission above 1 μm. The commercial isolator and WDM were fabricated with PM 980 fibers (5.5/125 µm, NA 0.13). The output end of the PM isolator was spliced to the signal port (PM 6/130 µm, NA 0.14) of the PM fiber combiner with a splice loss of 0.02 dB. Two fiber-coupled 915 nm multimode laser diodes were spliced to the pump ports (105/125 µm, NA 0.22) of the fiber combiner. The insertion losses of the PM fiber combiner are 0.7 dB for the 976 nm signal laser and 0.8 dB for the 915 nm pump laser, respectively. The maximum combined pump power was measured from the output port (PM 10/125 µm, NA 0.07) to be 70 W and the maximum signal power after the combiner was ~100 mW. The common port of the combiner was spliced to the Yb3+-doped phosphate fiber directly using Vytran GPX3400. The splice loss is less than 0.5 dB. The output end of the gain fiber was angle cleaved (~8°) to eliminate the influence of Fresnel reflection.

 figure: Fig. 3

Fig. 3 Schematic of the 976 nm Yb3+-doped double-clad phosphate fiber amplifier.

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The output spectrum was measured with an optical spectrum analyzer (Ando, AQ6317). A bandpass filter at 976 nm ( ± 10 nm) was located before the output end to remove the residual pump and 1030 nm ASE and the output powers were measured with a thermal power meter (Thorlabs, SC310C).

In our experiment, 6.5 cm, 7 cm, 8 cm and 10 cm Yb3+-doped phosphate fibers were tested. The output powers of these fiber amplifiers with an incident signal power of 100 mW were measured as shown in Fig. 4. The output powers of the 6.5 cm, 7 cm, 8 cm, and 10 cm fiber amplifiers are 2.58 W, 3.41 W, 3.14 W and 3.12 W respectively, at the maximum launched pump power of 70 W. The 7 cm fiber amplifier has the largest output power of 3.41 W with a slope efficiency of 6.8%, which is much lower than the core-pumped Yb3+-doped phosphate fiber amplifier [28]. This is mainly due to the relatively low spatial overlap between the pump and the doped fiber core in the cladding pumping configuration.

 figure: Fig. 4

Fig. 4 976 nm output power as a function of the launched pump power for the 6.5 cm, 7cm, 8 cm and 10 cm Yb3+-doped double-clad phosphate fiber amplifiers with 100 mW incident signal power.

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The spectra of the 6.5 cm, 7 cm and 10 cm fiber amplifiers at different pump powers were measured and are shown in Fig. 5. It is found that the amplified spontaneous emission (ASE) peaks at around 1007 nm, which is shorter than the 1030 nm ASE peak of silica fiber amplifiers [29]. This is in a good agreement with the fluorescence output spectra shown in Fig. 2. The power of the ASE at long wavelengths increases with the increased gain fiber length while the optical SNR decreases with the increased gain fiber length. At the maximum pump power, the 6.5 cm fiber amplifier has the smallest ASE with a SNR of 34.2 dB. ~21.1 dB SNR was achieved for the 7 cm fiber amplifier, while the SNR becomes 18.9 dB when the fiber length is 10 cm. It should be noted that the SNRs were calculated by dividing the 976 nm laser power by the total ASE power. It is also clear that there is no ASE peak around 980 nm, which has always been observed in the 976 nm silica fiber amplifiers [29]. This is because the gain peak of Yb3+-doped silica fiber is not at 976 nm as shown in Fig. 2. Hence a Yb3+-doped phosphate fiber amplifier has larger SNR than a Yb3+-doped silica fiber amplifier and can provide higher gain for the 976 nm single-frequency laser. This is another advantage of Yb3+-phosphate fiber over Yb3+-silica fiber for the 976 nm single-frequency laser amplifier.

 figure: Fig. 5

Fig. 5 Output spectra of the Yb3+-doped double-clad phosphate fiber amplifiers at different launched pump powers for (a) 6.5 cm fiber; (b) 7 cm fiber; (c) 10 cm fiber (resolution: 0.1 nm), inset: spectra measured with 0.01 nm resolution.

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The efficiency of the 976 nm Yb3+-doped double-clad fiber amplifier is still much lower than that of a Yb3+ fiber amplifier operating above 1 µm. Since the 976 nm laser operates near the zero-line wavelength of Yb3+, where the emission and absorption cross sections are equivalent, the quasi-three-level operation requires intense pump power for exciting 50% of the Yb3+-ions to create gain. Moreover, the quasi-four-level operation of Yb3+-doped fiber lasers above 1 µm is much more competitive, since the transparency population inversion is only 5%. Using a fiber with a smaller inner cladding and a larger core can help improve the efficiency. However, the core size cannot be too large for inducing multimode operation and the too small inner cladding will not be matched with that of the standard double-clad fibers. In order to overcome this problem, various techniques have been utilized to suppress the competitive laser at long wavelengths. So far, ring-doped fiber [30], jacked air-clad fiber [31, 32], rod-type photonic crystal fiber [9, 10], tapered fiber [33], depressed-clad hollow fiber [34], and spectral gain discrimination [35] have been demonstrated to achieve high power output around 980 nm. These special waveguide designs successfully realized in silica fibers should be able to be applied to phosphate fibers. Therefore, the efficiency of a 976 nm fiber amplifier will be significantly improved by using a Yb3+-doped double-clad phosphate fiber with special waveguide designs.

On the other hand, the mode mismatch between the combiner output fiber and phosphate fiber increase the losses of the signal and pump powers. The new phosphate fiber with the suitable core and cladding sizes will be drawn in the future work. Furthermore, the reflection from the un-optimized splice between the silica fiber and the phosphate fiber enhance the ASE at long wavelength and limit further power scaling. Thus the future effort to improve the splicing quality between the silica fiber and the phosphate fiber can be helpful for increasing output power and SNR will also be better. Because the 976 nm laser transition strongly depends on the population inversion, optimizing the fiber doping level can further increase the efficiency of a 976 nm cladding pumped fiber amplifier.

4. Conclusion

Significant efforts on the power scaling of 976 nm Yb3+-doped fiber lasers have been made in the last decade and 100-watt level laser output was successfully obtained. However, investigation on the power scaling of the 976 nm single-frequency laser using Yb3+-doped fiber amplifiers has been lagging behind. In addition to other schemes of the power scaling, it is very meaningful to study the amplification of the 976 nm single-frequency laser with different fiber materials.

In this paper, Yb3+-doped double-clad phosphate fiber was fabricated and used to investigate the power scaling of a 976 nm single-frequency fiber laser with cladding pumping. 3.41 W single-frequency output with an optical SNR of 21.1 dB was obtained from a 7 cm fiber amplifier. Our experiments have shown that Yb3+-doped fiber is a promising gain medium for 976 nm single-frequency laser amplifiers. The output power and the efficiency of the 976 nm single-frequency laser fiber amplifier can be significantly improved by using a phosphate fiber with an optimal concentration, a small inner cladding, a large core, and a specific waveguide to suppress the long wavelength ASE.

Funding

National Aeronautics and Space Administration (NASA) Small Business Technology Transfer (STTR) Phase II (NNX15CP19C); National Science Foundation Engineering Research Center for Integrated Access Networks (EEC-0812072); Technology Research Initiative Fund (TRIF) Photonics Initiative of the University of Arizona.

References and links

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2. S. Gray, A. Liu, D. T. Walton, J. Wang, M. J. Li, X. Chen, A. B. Ruffin, J. A. Demeritt, and L. A. Zenteno, “502 Watt, single transverse mode, narrow linewidth, bidirectionally pumped Yb-doped fiber amplifier,” Opt. Express 15(25), 17044–17050 (2007). [CrossRef]   [PubMed]  

3. G. D. Goodno, L. D. Book, and J. E. Rothenberg, “Low-phase-noise, single-frequency, single-mode 608 W thulium fiber amplifier,” Opt. Lett. 34(8), 1204–1206 (2009). [CrossRef]   [PubMed]  

4. W. Shi, Q. Fang, X. Zhu, R. A. Norwood, and N. Peyghambarian, “Fiber lasers and their applications [Invited],” Appl. Opt. 53(28), 6554–6568 (2014). [CrossRef]   [PubMed]  

5. V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling,” Proc. SPIE 4974, 193–201 (2003). [CrossRef]  

6. D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004). [CrossRef]  

7. A. Bouchier, G. Lucas-Leclin, P. Georges, and J. Maillard, “Frequency doubling of an efficient continuous wave single-mode Yb-doped fiber laser at 978 nm in a periodically-poled MgO:LiNbO3 waveguide,” Opt. Express 13(18), 6974–6979 (2005). [CrossRef]   [PubMed]  

8. S. Zou, P. Li, L. Wang, M. Chen, and G. Li, “980 nm Yb-doped singlemode fiber laser and its frequency-doubling with BIBO,” Appl. Phys. B 95(4), 685–690 (2009). [CrossRef]  

9. F. Röser, C. Jauregui, J. Limpert, and A. Tünnermann, “94 W 980 nm high brightness Yb-doped fiber laser,” Opt. Express 16(22), 17310–17318 (2008). [CrossRef]   [PubMed]  

10. J. Boullet, Y. Zaouter, R. Desmarchelier, M. Cazaux, F. Salin, J. Saby, R. Bello-Doua, and E. Cormier, “High power ytterbium-doped rod-type three-level photonic crystal fiber laser,” Opt. Express 16(22), 17891–17902 (2008). [CrossRef]   [PubMed]  

11. R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999). [CrossRef]  

12. H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004). [CrossRef]  

13. X. Zhu, W. Shi, J. Zong, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-frequency distributed Bragg reflector fiber laser,” Opt. Lett. 37(20), 4167–4169 (2012). [CrossRef]   [PubMed]  

14. Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014). [CrossRef]  

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16. J. Boullet, R. Dubrasquet, C. Médina, R. Bello-Doua, N. Traynor, and E. Cormier, “Millijoule-class Yb-doped pulsed fiber laser operating at 977 nm,” Opt. Lett. 35(10), 1650–1652 (2010). [CrossRef]   [PubMed]  

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24. Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “20 W single-mode Yb3+ -doped phosphate fiber laser,” Opt. Lett. 31(22), 3255–3257 (2006). [CrossRef]   [PubMed]  

25. Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009). [CrossRef]  

26. S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000). [CrossRef]  

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28. X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013). [CrossRef]  

29. J. Wu, X. Zhu, V. Temyanko, L. LaComb, R. Norwood, and N. Peyghambarian, “Power scaling of single-frequency fiber amplifiers at 976 nm,” in Conference on Lasers and Electro-Optics, OSA Technical Digest (2016) (Optical Society of America, 2016), paper SM1Q.5. [CrossRef]  

30. J. Nilsson, J. D. Minelly, R. Paschotta, A. C. Tropper, and D. C. Hanna, “Ring-doped cladding-pumped single-mode three-level fiber laser,” Opt. Lett. 23(5), 355–357 (1998). [CrossRef]   [PubMed]  

31. V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling”, Advances in Fiber Devices, Proc. SPIE 4974, 193–201 (2003). [CrossRef]  

32. R. Selves, J. K. Sahu, L. B. Fu, J. N. Jang, J. Nilsson, A. B. Grudinin, K. H. Ylä-Jarkko, S. A. Alam, P. W. Turner, and J. Moore, “High-power, low-noise, Yb-doped, cladding-pumped, three-level fiber sources at 980 nm,” Opt. Lett. 28(13), 1093–1095 (2003). [CrossRef]   [PubMed]  

33. M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014). [CrossRef]  

34. J. Kim, D. B. S. Soh, C. Codemard, S. Yoo, J. Nilsson, and J. K. Sahu, “Yb:Al-doped depressed clad hollow optical fiber laser operating at 980 nm”, in Proceedings of 2005 Pacific Rim Conference on Lasers & Electro-Optics (CLEO/Pacific Rim, 2005), pp. CTuI4–5. [CrossRef]  

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References

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  1. C. V. Poulsen, P. Varming, J. E. Pedersen, M. Beukema, and S. L. Lauridsen, “Applications of single frequency fiber lasers,” in Proceedings of the Conference on Lasers and Electro-Optics Europe (CLEO/Europe, 2003), pp. 617.
  2. S. Gray, A. Liu, D. T. Walton, J. Wang, M. J. Li, X. Chen, A. B. Ruffin, J. A. Demeritt, and L. A. Zenteno, “502 Watt, single transverse mode, narrow linewidth, bidirectionally pumped Yb-doped fiber amplifier,” Opt. Express 15(25), 17044–17050 (2007).
    [Crossref] [PubMed]
  3. G. D. Goodno, L. D. Book, and J. E. Rothenberg, “Low-phase-noise, single-frequency, single-mode 608 W thulium fiber amplifier,” Opt. Lett. 34(8), 1204–1206 (2009).
    [Crossref] [PubMed]
  4. W. Shi, Q. Fang, X. Zhu, R. A. Norwood, and N. Peyghambarian, “Fiber lasers and their applications [Invited],” Appl. Opt. 53(28), 6554–6568 (2014).
    [Crossref] [PubMed]
  5. V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling,” Proc. SPIE 4974, 193–201 (2003).
    [Crossref]
  6. D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
    [Crossref]
  7. A. Bouchier, G. Lucas-Leclin, P. Georges, and J. Maillard, “Frequency doubling of an efficient continuous wave single-mode Yb-doped fiber laser at 978 nm in a periodically-poled MgO:LiNbO3 waveguide,” Opt. Express 13(18), 6974–6979 (2005).
    [Crossref] [PubMed]
  8. S. Zou, P. Li, L. Wang, M. Chen, and G. Li, “980 nm Yb-doped singlemode fiber laser and its frequency-doubling with BIBO,” Appl. Phys. B 95(4), 685–690 (2009).
    [Crossref]
  9. F. Röser, C. Jauregui, J. Limpert, and A. Tünnermann, “94 W 980 nm high brightness Yb-doped fiber laser,” Opt. Express 16(22), 17310–17318 (2008).
    [Crossref] [PubMed]
  10. J. Boullet, Y. Zaouter, R. Desmarchelier, M. Cazaux, F. Salin, J. Saby, R. Bello-Doua, and E. Cormier, “High power ytterbium-doped rod-type three-level photonic crystal fiber laser,” Opt. Express 16(22), 17891–17902 (2008).
    [Crossref] [PubMed]
  11. R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999).
    [Crossref]
  12. H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
    [Crossref]
  13. X. Zhu, W. Shi, J. Zong, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-frequency distributed Bragg reflector fiber laser,” Opt. Lett. 37(20), 4167–4169 (2012).
    [Crossref] [PubMed]
  14. Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014).
    [Crossref]
  15. D. B. S. Soh, C. Codemard, J. K. Sahu, J. Nilsson, V. Philippov, C. Alegria, and Y. Jeong, “A 4.3 W 977 nm ytterbium-doped jacketed-air-clad fiber amplifier,” in Advanced Solid-State Photonics, OSA Technical Digest (Optical Society of America, 2004), paper MA3.
    [Crossref]
  16. J. Boullet, R. Dubrasquet, C. Médina, R. Bello-Doua, N. Traynor, and E. Cormier, “Millijoule-class Yb-doped pulsed fiber laser operating at 977 nm,” Opt. Lett. 35(10), 1650–1652 (2010).
    [Crossref] [PubMed]
  17. R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, and D. C. Hanna, “Lifetime quenching in Yb-doped fibres,” Opt. Commun. 136(5-6), 375–378 (1997).
    [Crossref]
  18. J. J. Koponen, M. J. Söderlund, H. J. Hoffman, S. K. T. Tammela, and H. Po, “Photodarkening in ytterbium-doped silica fibers,” Proc. SPIE 5990, 599008 (2005).
    [Crossref]
  19. S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
    [Crossref]
  20. Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “Measurement of high-photodarkening resistance in phosphate fiber doped with 12% Yb2O3,” Proc. SPIE 6873, 68731D (2008).
    [Crossref]
  21. X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
    [Crossref]
  22. M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
    [Crossref]
  23. M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
    [Crossref]
  24. Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “20 W single-mode Yb3+ -doped phosphate fiber laser,” Opt. Lett. 31(22), 3255–3257 (2006).
    [Crossref] [PubMed]
  25. Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009).
    [Crossref]
  26. S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
    [Crossref]
  27. R. Paschotta, J. Nilsson, A. C. Tropper, and D. C. Hanna, “Ytterbium-doped fiber amplifiers,” IEEE J. Quantum Electron. 33(7), 1049–1056 (1997).
    [Crossref]
  28. X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
    [Crossref]
  29. J. Wu, X. Zhu, V. Temyanko, L. LaComb, R. Norwood, and N. Peyghambarian, “Power scaling of single-frequency fiber amplifiers at 976 nm,” in Conference on Lasers and Electro-Optics, OSA Technical Digest (2016) (Optical Society of America, 2016), paper SM1Q.5.
    [Crossref]
  30. J. Nilsson, J. D. Minelly, R. Paschotta, A. C. Tropper, and D. C. Hanna, “Ring-doped cladding-pumped single-mode three-level fiber laser,” Opt. Lett. 23(5), 355–357 (1998).
    [Crossref] [PubMed]
  31. V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling”, Advances in Fiber Devices, Proc. SPIE 4974, 193–201 (2003).
    [Crossref]
  32. R. Selves, J. K. Sahu, L. B. Fu, J. N. Jang, J. Nilsson, A. B. Grudinin, K. H. Ylä-Jarkko, S. A. Alam, P. W. Turner, and J. Moore, “High-power, low-noise, Yb-doped, cladding-pumped, three-level fiber sources at 980 nm,” Opt. Lett. 28(13), 1093–1095 (2003).
    [Crossref] [PubMed]
  33. M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
    [Crossref]
  34. J. Kim, D. B. S. Soh, C. Codemard, S. Yoo, J. Nilsson, and J. K. Sahu, “Yb:Al-doped depressed clad hollow optical fiber laser operating at 980 nm”, in Proceedings of 2005 Pacific Rim Conference on Lasers & Electro-Optics (CLEO/Pacific Rim, 2005), pp. CTuI4–5.
    [Crossref]
  35. L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
    [Crossref]

2014 (3)

W. Shi, Q. Fang, X. Zhu, R. A. Norwood, and N. Peyghambarian, “Fiber lasers and their applications [Invited],” Appl. Opt. 53(28), 6554–6568 (2014).
[Crossref] [PubMed]

Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014).
[Crossref]

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

2013 (2)

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

2012 (1)

2010 (1)

2009 (3)

G. D. Goodno, L. D. Book, and J. E. Rothenberg, “Low-phase-noise, single-frequency, single-mode 608 W thulium fiber amplifier,” Opt. Lett. 34(8), 1204–1206 (2009).
[Crossref] [PubMed]

S. Zou, P. Li, L. Wang, M. Chen, and G. Li, “980 nm Yb-doped singlemode fiber laser and its frequency-doubling with BIBO,” Appl. Phys. B 95(4), 685–690 (2009).
[Crossref]

Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009).
[Crossref]

2008 (3)

2007 (1)

2006 (1)

2005 (2)

2004 (2)

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

2003 (3)

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling,” Proc. SPIE 4974, 193–201 (2003).
[Crossref]

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling”, Advances in Fiber Devices, Proc. SPIE 4974, 193–201 (2003).
[Crossref]

R. Selves, J. K. Sahu, L. B. Fu, J. N. Jang, J. Nilsson, A. B. Grudinin, K. H. Ylä-Jarkko, S. A. Alam, P. W. Turner, and J. Moore, “High-power, low-noise, Yb-doped, cladding-pumped, three-level fiber sources at 980 nm,” Opt. Lett. 28(13), 1093–1095 (2003).
[Crossref] [PubMed]

2001 (3)

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

2000 (1)

S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
[Crossref]

1999 (1)

R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999).
[Crossref]

1998 (1)

1997 (3)

R. Paschotta, J. Nilsson, A. C. Tropper, and D. C. Hanna, “Ytterbium-doped fiber amplifiers,” IEEE J. Quantum Electron. 33(7), 1049–1056 (1997).
[Crossref]

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, and D. C. Hanna, “Lifetime quenching in Yb-doped fibres,” Opt. Commun. 136(5-6), 375–378 (1997).
[Crossref]

Alam, S. A.

Alegria, C.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

Ariel, Y.

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling,” Proc. SPIE 4974, 193–201 (2003).
[Crossref]

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling”, Advances in Fiber Devices, Proc. SPIE 4974, 193–201 (2003).
[Crossref]

Baek, S.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

Bar Chaim, N.

R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999).
[Crossref]

Barber, P. R.

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, and D. C. Hanna, “Lifetime quenching in Yb-doped fibres,” Opt. Commun. 136(5-6), 375–378 (1997).
[Crossref]

Bartelt, H.

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

Becker, M.

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

Bello-Doua, R.

Book, L. D.

Bouchier, A.

Boullet, J.

Braun, M.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Bugge, F.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Byer, R. L.

Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “Measurement of high-photodarkening resistance in phosphate fiber doped with 12% Yb2O3,” Proc. SPIE 6873, 68731D (2008).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “20 W single-mode Yb3+ -doped phosphate fiber laser,” Opt. Lett. 31(22), 3255–3257 (2006).
[Crossref] [PubMed]

Caplen, J. E.

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, and D. C. Hanna, “Lifetime quenching in Yb-doped fibres,” Opt. Commun. 136(5-6), 375–378 (1997).
[Crossref]

Cazaux, M.

Chavez-Pirson, A.

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, W. Shi, J. Zong, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-frequency distributed Bragg reflector fiber laser,” Opt. Lett. 37(20), 4167–4169 (2012).
[Crossref] [PubMed]

Chen, M.

S. Zou, P. Li, L. Wang, M. Chen, and G. Li, “980 nm Yb-doped singlemode fiber laser and its frequency-doubling with BIBO,” Appl. Phys. B 95(4), 685–690 (2009).
[Crossref]

Chen, X.

Codemard, C.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

Cormier, E.

Crigler, S. G.

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

Day, D. E.

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

Dejneka, M. J.

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

Demeritt, J. A.

Desmarchelier, R.

Digonnet, M. J. F.

Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “Measurement of high-photodarkening resistance in phosphate fiber doped with 12% Yb2O3,” Proc. SPIE 6873, 68731D (2008).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “20 W single-mode Yb3+ -doped phosphate fiber laser,” Opt. Lett. 31(22), 3255–3257 (2006).
[Crossref] [PubMed]

Dubrasquet, R.

Eger, D.

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling,” Proc. SPIE 4974, 193–201 (2003).
[Crossref]

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling”, Advances in Fiber Devices, Proc. SPIE 4974, 193–201 (2003).
[Crossref]

Ellison, A. J. G.

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

Erbert, G.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Fang, Q.

W. Shi, Q. Fang, X. Zhu, R. A. Norwood, and N. Peyghambarian, “Fiber lasers and their applications [Invited],” Appl. Opt. 53(28), 6554–6568 (2014).
[Crossref] [PubMed]

Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014).
[Crossref]

Fricke, J.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Fu, L. B.

Georges, P.

Goodno, G. D.

Gray, S.

Griebner, U.

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

Grimm, S.

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

Grudinin, A. B.

Hamlin, S. J.

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

Hanna, D. C.

J. Nilsson, J. D. Minelly, R. Paschotta, A. C. Tropper, and D. C. Hanna, “Ring-doped cladding-pumped single-mode three-level fiber laser,” Opt. Lett. 23(5), 355–357 (1998).
[Crossref] [PubMed]

R. Paschotta, J. Nilsson, A. C. Tropper, and D. C. Hanna, “Ytterbium-doped fiber amplifiers,” IEEE J. Quantum Electron. 33(7), 1049–1056 (1997).
[Crossref]

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, and D. C. Hanna, “Lifetime quenching in Yb-doped fibres,” Opt. Commun. 136(5-6), 375–378 (1997).
[Crossref]

Hartung, A.

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

Hoffman, H. J.

J. J. Koponen, M. J. Söderlund, H. J. Hoffman, S. K. T. Tammela, and H. Po, “Photodarkening in ytterbium-doped silica fibers,” Proc. SPIE 5990, 599008 (2005).
[Crossref]

Hoh, D.

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

Hwang, B. C.

S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
[Crossref]

Jager, M.

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

Jang, J. N.

Jauregui, C.

Jeong, Y.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

Jetschke, S.

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

Jiang, S.

Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “Measurement of high-photodarkening resistance in phosphate fiber doped with 12% Yb2O3,” Proc. SPIE 6873, 68731D (2008).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “20 W single-mode Yb3+ -doped phosphate fiber laser,” Opt. Lett. 31(22), 3255–3257 (2006).
[Crossref] [PubMed]

S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
[Crossref]

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

Karabulut, M.

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

Klehr, A.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Knauer, A.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Koch, R.

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

Koponen, J. J.

J. J. Koponen, M. J. Söderlund, H. J. Hoffman, S. K. T. Tammela, and H. Po, “Photodarkening in ytterbium-doped silica fibers,” Proc. SPIE 5990, 599008 (2005).
[Crossref]

Kuksenkov, D. V.

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

Kurkjian, C. R.

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

Lammert, R. M.

R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999).
[Crossref]

Laurell, F.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

Lee, Y. W.

Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “Measurement of high-photodarkening resistance in phosphate fiber doped with 12% Yb2O3,” Proc. SPIE 6873, 68731D (2008).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “20 W single-mode Yb3+ -doped phosphate fiber laser,” Opt. Lett. 31(22), 3255–3257 (2006).
[Crossref] [PubMed]

Leich, M.

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

Li, G.

S. Zou, P. Li, L. Wang, M. Chen, and G. Li, “980 nm Yb-doped singlemode fiber laser and its frequency-doubling with BIBO,” Appl. Phys. B 95(4), 685–690 (2009).
[Crossref]

Li, M. J.

Li, P.

S. Zou, P. Li, L. Wang, M. Chen, and G. Li, “980 nm Yb-doped singlemode fiber laser and its frequency-doubling with BIBO,” Appl. Phys. B 95(4), 685–690 (2009).
[Crossref]

Limpert, J.

Liu, A.

S. Gray, A. Liu, D. T. Walton, J. Wang, M. J. Li, X. Chen, A. B. Ruffin, J. A. Demeritt, and L. A. Zenteno, “502 Watt, single transverse mode, narrow linewidth, bidirectionally pumped Yb-doped fiber amplifier,” Opt. Express 15(25), 17044–17050 (2007).
[Crossref] [PubMed]

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

Lucas, J.

S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
[Crossref]

Lucas-Leclin, G.

Luo, T.

S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
[Crossref]

Maillard, J.

Marasinghe, G. K.

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

Médina, C.

Melnik, E.

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

Minelly, J. D.

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

J. Nilsson, J. D. Minelly, R. Paschotta, A. C. Tropper, and D. C. Hanna, “Ring-doped cladding-pumped single-mode three-level fiber laser,” Opt. Lett. 23(5), 355–357 (1998).
[Crossref] [PubMed]

Moore, J.

Myers, J. D.

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

Myers, M. J.

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

Newkirk, M. A.

R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999).
[Crossref]

Nguyen, D.

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, W. Shi, J. Zong, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-frequency distributed Bragg reflector fiber laser,” Opt. Lett. 37(20), 4167–4169 (2012).
[Crossref] [PubMed]

Nilsson, J.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

R. Selves, J. K. Sahu, L. B. Fu, J. N. Jang, J. Nilsson, A. B. Grudinin, K. H. Ylä-Jarkko, S. A. Alam, P. W. Turner, and J. Moore, “High-power, low-noise, Yb-doped, cladding-pumped, three-level fiber sources at 980 nm,” Opt. Lett. 28(13), 1093–1095 (2003).
[Crossref] [PubMed]

J. Nilsson, J. D. Minelly, R. Paschotta, A. C. Tropper, and D. C. Hanna, “Ring-doped cladding-pumped single-mode three-level fiber laser,” Opt. Lett. 23(5), 355–357 (1998).
[Crossref] [PubMed]

R. Paschotta, J. Nilsson, A. C. Tropper, and D. C. Hanna, “Ytterbium-doped fiber amplifiers,” IEEE J. Quantum Electron. 33(7), 1049–1056 (1997).
[Crossref]

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, and D. C. Hanna, “Lifetime quenching in Yb-doped fibres,” Opt. Commun. 136(5-6), 375–378 (1997).
[Crossref]

Norwood, R. A.

W. Shi, Q. Fang, X. Zhu, R. A. Norwood, and N. Peyghambarian, “Fiber lasers and their applications [Invited],” Appl. Opt. 53(28), 6554–6568 (2014).
[Crossref] [PubMed]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, W. Shi, J. Zong, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-frequency distributed Bragg reflector fiber laser,” Opt. Lett. 37(20), 4167–4169 (2012).
[Crossref] [PubMed]

Osowski, M. L.

R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999).
[Crossref]

Paschotta, R.

J. Nilsson, J. D. Minelly, R. Paschotta, A. C. Tropper, and D. C. Hanna, “Ring-doped cladding-pumped single-mode three-level fiber laser,” Opt. Lett. 23(5), 355–357 (1998).
[Crossref] [PubMed]

R. Paschotta, J. Nilsson, A. C. Tropper, and D. C. Hanna, “Ytterbium-doped fiber amplifiers,” IEEE J. Quantum Electron. 33(7), 1049–1056 (1997).
[Crossref]

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, and D. C. Hanna, “Lifetime quenching in Yb-doped fibres,” Opt. Commun. 136(5-6), 375–378 (1997).
[Crossref]

Patlahn, A.

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling,” Proc. SPIE 4974, 193–201 (2003).
[Crossref]

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling”, Advances in Fiber Devices, Proc. SPIE 4974, 193–201 (2003).
[Crossref]

Peyghambarian, N.

W. Shi, Q. Fang, X. Zhu, R. A. Norwood, and N. Peyghambarian, “Fiber lasers and their applications [Invited],” Appl. Opt. 53(28), 6554–6568 (2014).
[Crossref] [PubMed]

Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, W. Shi, J. Zong, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-frequency distributed Bragg reflector fiber laser,” Opt. Lett. 37(20), 4167–4169 (2012).
[Crossref] [PubMed]

Peyghambariana, N.

S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
[Crossref]

Philippov, V.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

Po, H.

J. J. Koponen, M. J. Söderlund, H. J. Hoffman, S. K. T. Tammela, and H. Po, “Photodarkening in ytterbium-doped silica fibers,” Proc. SPIE 5990, 599008 (2005).
[Crossref]

Prosentsov, V.

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling,” Proc. SPIE 4974, 193–201 (2003).
[Crossref]

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling”, Advances in Fiber Devices, Proc. SPIE 4974, 193–201 (2003).
[Crossref]

Qi, H.

R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999).
[Crossref]

Ray, C. S.

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

Ressel, P.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Rhonehouse, D. L.

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

Röser, F.

Rothenberg, J. E.

Ruffin, A. B.

Saby, J.

Sahu, J. K.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

R. Selves, J. K. Sahu, L. B. Fu, J. N. Jang, J. Nilsson, A. B. Grudinin, K. H. Ylä-Jarkko, S. A. Alam, P. W. Turner, and J. Moore, “High-power, low-noise, Yb-doped, cladding-pumped, three-level fiber sources at 980 nm,” Opt. Lett. 28(13), 1093–1095 (2003).
[Crossref] [PubMed]

Salin, F.

Schonnagel, H.

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

Selves, R.

Seneschala, K.

S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
[Crossref]

Sherman, E.

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling”, Advances in Fiber Devices, Proc. SPIE 4974, 193–201 (2003).
[Crossref]

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling,” Proc. SPIE 4974, 193–201 (2003).
[Crossref]

Shi, W.

W. Shi, Q. Fang, X. Zhu, R. A. Norwood, and N. Peyghambarian, “Fiber lasers and their applications [Invited],” Appl. Opt. 53(28), 6554–6568 (2014).
[Crossref] [PubMed]

Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, W. Shi, J. Zong, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-frequency distributed Bragg reflector fiber laser,” Opt. Lett. 37(20), 4167–4169 (2012).
[Crossref] [PubMed]

Sinha, S.

Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “Measurement of high-photodarkening resistance in phosphate fiber doped with 12% Yb2O3,” Proc. SPIE 6873, 68731D (2008).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “20 W single-mode Yb3+ -doped phosphate fiber laser,” Opt. Lett. 31(22), 3255–3257 (2006).
[Crossref] [PubMed]

Smekatala, F.

S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
[Crossref]

Söderlund, M. J.

J. J. Koponen, M. J. Söderlund, H. J. Hoffman, S. K. T. Tammela, and H. Po, “Photodarkening in ytterbium-doped silica fibers,” Proc. SPIE 5990, 599008 (2005).
[Crossref]

Soh, D. B. S.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

Stefan, R.

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

Sumpf, B.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Tammela, S. K. T.

J. J. Koponen, M. J. Söderlund, H. J. Hoffman, S. K. T. Tammela, and H. Po, “Photodarkening in ytterbium-doped silica fibers,” Proc. SPIE 5990, 599008 (2005).
[Crossref]

Tian, X.

Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014).
[Crossref]

Traenkle, G.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Traynor, N.

Tropper, A. C.

J. Nilsson, J. D. Minelly, R. Paschotta, A. C. Tropper, and D. C. Hanna, “Ring-doped cladding-pumped single-mode three-level fiber laser,” Opt. Lett. 23(5), 355–357 (1998).
[Crossref] [PubMed]

R. Paschotta, J. Nilsson, A. C. Tropper, and D. C. Hanna, “Ytterbium-doped fiber amplifiers,” IEEE J. Quantum Electron. 33(7), 1049–1056 (1997).
[Crossref]

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, and D. C. Hanna, “Lifetime quenching in Yb-doped fibres,” Opt. Commun. 136(5-6), 375–378 (1997).
[Crossref]

Tünnermann, A.

Turner, P. W.

Ungar, J. E.

R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999).
[Crossref]

Urbanek, K. E.

Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009).
[Crossref]

Walton, D. T.

S. Gray, A. Liu, D. T. Walton, J. Wang, M. J. Li, X. Chen, A. B. Ruffin, J. A. Demeritt, and L. A. Zenteno, “502 Watt, single transverse mode, narrow linewidth, bidirectionally pumped Yb-doped fiber amplifier,” Opt. Express 15(25), 17044–17050 (2007).
[Crossref] [PubMed]

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

Wang, B.

Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014).
[Crossref]

Wang, J.

Wang, L.

S. Zou, P. Li, L. Wang, M. Chen, and G. Li, “980 nm Yb-doped singlemode fiber laser and its frequency-doubling with BIBO,” Appl. Phys. B 95(4), 685–690 (2009).
[Crossref]

Wang, S.

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

Wenzel, H.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Weyers, M.

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

Wiersma, K.

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

Yao, J.

Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014).
[Crossref]

Ylä-Jarkko, K. H.

Zaouter, Y.

Zenteno, L. A.

S. Gray, A. Liu, D. T. Walton, J. Wang, M. J. Li, X. Chen, A. B. Ruffin, J. A. Demeritt, and L. A. Zenteno, “502 Watt, single transverse mode, narrow linewidth, bidirectionally pumped Yb-doped fiber amplifier,” Opt. Express 15(25), 17044–17050 (2007).
[Crossref] [PubMed]

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

Zhu, G.

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

Zhu, X.

W. Shi, Q. Fang, X. Zhu, R. A. Norwood, and N. Peyghambarian, “Fiber lasers and their applications [Invited],” Appl. Opt. 53(28), 6554–6568 (2014).
[Crossref] [PubMed]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, W. Shi, J. Zong, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-frequency distributed Bragg reflector fiber laser,” Opt. Lett. 37(20), 4167–4169 (2012).
[Crossref] [PubMed]

Zong, J.

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, W. Shi, J. Zong, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-frequency distributed Bragg reflector fiber laser,” Opt. Lett. 37(20), 4167–4169 (2012).
[Crossref] [PubMed]

Zou, S.

S. Zou, P. Li, L. Wang, M. Chen, and G. Li, “980 nm Yb-doped singlemode fiber laser and its frequency-doubling with BIBO,” Appl. Phys. B 95(4), 685–690 (2009).
[Crossref]

Advances in Fiber Devices, Proc. SPIE (1)

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling”, Advances in Fiber Devices, Proc. SPIE 4974, 193–201 (2003).
[Crossref]

Appl. Opt. (1)

Appl. Phys. B (1)

S. Zou, P. Li, L. Wang, M. Chen, and G. Li, “980 nm Yb-doped singlemode fiber laser and its frequency-doubling with BIBO,” Appl. Phys. B 95(4), 685–690 (2009).
[Crossref]

Electron. Lett. (1)

L. A. Zenteno, J. D. Minelly, A. Liu, A. J. G. Ellison, S. G. Crigler, D. T. Walton, D. V. Kuksenkov, and M. J. Dejneka, “1 W single-transverse-mode Yb-doped double-clad fiber laser at 978 nm,” Electron. Lett. 37(13), 819–820 (2001).
[Crossref]

IEEE J. Quantum Electron. (1)

R. Paschotta, J. Nilsson, A. C. Tropper, and D. C. Hanna, “Ytterbium-doped fiber amplifiers,” IEEE J. Quantum Electron. 33(7), 1049–1056 (1997).
[Crossref]

IEEE J. Sel. Top. Quantum Electron. (1)

Y. W. Lee, M. J. F. Digonnet, S. Sinha, K. E. Urbanek, R. L. Byer, and S. Jiang, “High-power Yb3+-doped phosphate fiber amplifier,” IEEE J. Sel. Top. Quantum Electron. 15(1), 93–102 (2009).
[Crossref]

IEEE Photonics Technol. Lett. (5)

Q. Fang, W. Shi, X. Tian, B. Wang, J. Yao, and N. Peyghambarian, “978 nm single frequency actively Q-Switched all fiber laser,” IEEE Photonics Technol. Lett. 26, 874–876 (2014).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

X. Zhu, G. Zhu, W. Shi, J. Zong, K. Wiersma, D. Nguyen, R. A. Norwood, A. Chavez-Pirson, and N. Peyghambarian, “976 nm single-polarization single frequency yetterbium-doped phosphate fiber amplifiers,” IEEE Photonics Technol. Lett. 25(14), 1365–1368 (2013).
[Crossref]

D. B. S. Soh, C. Codemard, S. Wang, J. Nilsson, J. K. Sahu, F. Laurell, V. Philippov, Y. Jeong, C. Alegria, and S. Baek, “A 980 nm Yb-doped fiber MOPA source and its frequency doubling,” IEEE Photonics Technol. Lett. 16, 1032–1034 (2004).
[Crossref]

R. M. Lammert, J. E. Ungar, M. L. Osowski, H. Qi, M. A. Newkirk, and N. Bar Chaim, “980-nm master oscillator power amplifiers with nonabsorbing mirrors,” IEEE Photonics Technol. Lett. 11(9), 1099–1101 (1999).
[Crossref]

J. Non-Cryst. Solids (3)

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

M. Karabulut, E. Melnik, R. Stefan, G. K. Marasinghe, C. S. Ray, C. R. Kurkjian, and D. E. Day, “Mechanical and structural properties of phosphate glasses,” J. Non-Cryst. Solids 288(1-3), 8–17 (2001).
[Crossref]

S. Jiang, T. Luo, B. C. Hwang, F. Smekatala, K. Seneschala, J. Lucas, and N. Peyghambariana, “Er3+-doped phosphate glasses for fiber amplifiers with high gain per unit length,” J. Non-Cryst. Solids 263-264, 364–368 (2000).
[Crossref]

Laser Phys. Lett. (1)

M. Leich, M. Jager, S. Grimm, D. Hoh, S. Jetschke, M. Becker, A. Hartung, and H. Bartelt, “Tapered large-core 976 nm Yb-doped fiber laser with 10 W output power,” Laser Phys. Lett. 11(4), 045102 (2014).
[Crossref]

Opt. Commun. (1)

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, and D. C. Hanna, “Lifetime quenching in Yb-doped fibres,” Opt. Commun. 136(5-6), 375–378 (1997).
[Crossref]

Opt. Express (4)

Opt. Lett. (6)

Proc. SPIE (5)

H. Wenzel, A. Klehr, M. Braun, F. Bugge, G. Erbert, J. Fricke, A. Knauer, P. Ressel, B. Sumpf, M. Weyers, and G. Traenkle, “Design and realization of high-power DFB lasers,” Proc. SPIE 5594, 110–123 (2004).
[Crossref]

J. J. Koponen, M. J. Söderlund, H. J. Hoffman, S. K. T. Tammela, and H. Po, “Photodarkening in ytterbium-doped silica fibers,” Proc. SPIE 5990, 599008 (2005).
[Crossref]

S. Jiang, M. J. Myers, D. L. Rhonehouse, S. J. Hamlin, J. D. Myers, U. Griebner, R. Koch, and H. Schonnagel, “Ytterbium-doped phosphate laser glasses,” Proc. SPIE 2986, 10–15 (1997).
[Crossref]

Y. W. Lee, S. Sinha, M. J. F. Digonnet, R. L. Byer, and S. Jiang, “Measurement of high-photodarkening resistance in phosphate fiber doped with 12% Yb2O3,” Proc. SPIE 6873, 68731D (2008).
[Crossref]

V. Prosentsov, E. Sherman, A. Patlahn, Y. Ariel, and D. Eger, “Efficient Yb-doped air-clad fiber laser operating at 980 nm and its frequency doubling,” Proc. SPIE 4974, 193–201 (2003).
[Crossref]

Other (4)

C. V. Poulsen, P. Varming, J. E. Pedersen, M. Beukema, and S. L. Lauridsen, “Applications of single frequency fiber lasers,” in Proceedings of the Conference on Lasers and Electro-Optics Europe (CLEO/Europe, 2003), pp. 617.

D. B. S. Soh, C. Codemard, J. K. Sahu, J. Nilsson, V. Philippov, C. Alegria, and Y. Jeong, “A 4.3 W 977 nm ytterbium-doped jacketed-air-clad fiber amplifier,” in Advanced Solid-State Photonics, OSA Technical Digest (Optical Society of America, 2004), paper MA3.
[Crossref]

J. Wu, X. Zhu, V. Temyanko, L. LaComb, R. Norwood, and N. Peyghambarian, “Power scaling of single-frequency fiber amplifiers at 976 nm,” in Conference on Lasers and Electro-Optics, OSA Technical Digest (2016) (Optical Society of America, 2016), paper SM1Q.5.
[Crossref]

J. Kim, D. B. S. Soh, C. Codemard, S. Yoo, J. Nilsson, and J. K. Sahu, “Yb:Al-doped depressed clad hollow optical fiber laser operating at 980 nm”, in Proceedings of 2005 Pacific Rim Conference on Lasers & Electro-Optics (CLEO/Pacific Rim, 2005), pp. CTuI4–5.
[Crossref]

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Figures (5)

Fig. 1
Fig. 1 (a) The end-face of the Yb3+-doped double-clad phosphate fiber; absorption and emission cross-sections of Yb3+ ions in (b) phosphate and (c) silica glasses [27].
Fig. 2
Fig. 2 ASE spectra of Yb3+-doped silica and phosphate fibers (resolution: 0.1 nm).
Fig. 3
Fig. 3 Schematic of the 976 nm Yb3+-doped double-clad phosphate fiber amplifier.
Fig. 4
Fig. 4 976 nm output power as a function of the launched pump power for the 6.5 cm, 7cm, 8 cm and 10 cm Yb3+-doped double-clad phosphate fiber amplifiers with 100 mW incident signal power.
Fig. 5
Fig. 5 Output spectra of the Yb3+-doped double-clad phosphate fiber amplifiers at different launched pump powers for (a) 6.5 cm fiber; (b) 7 cm fiber; (c) 10 cm fiber (resolution: 0.1 nm), inset: spectra measured with 0.01 nm resolution.

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