Abstract

We report a high SBS-threshold, single-frequency, single-mode, polarization maintaining (PM) monolithic pulsed fiber laser source in master oscillator and power amplifier (MOPA) configuration that can operate over the C-band. In order to achieve a narrow transform-limited linewidth for pulses longer than 100 ns, we use a single-frequency Q-switched fiber laser seed, which itself can be seamlessly tuned up to 1.24 μs. The Q-switched pulses are amplified in the power amplifier stage of MOPA using a high SBS threshold single-mode PM large core highly Er/Yb co-doped phosphate glass fiber (LC-EYPhF). This seed and amplifier combination represents the first monolithic, all-fiber implementation of a single-frequency pulsed laser with the highest pulse energy of 54 μJ and peak power of 332 W for 153-ns pulses at 1538 nm.

© 2009 Optical Society of America

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    [CrossRef] [PubMed]
  2. C. E. Dilley, M. A. Stephen, and M. P. Savage-Leuchs, "High SBS-threshold, narrowband, erbium co-doped with ytterbium fiber amplifier pulses frequency-doubled to 770 nm," Opt. Express 15, 14389-14395 (2007).
    [CrossRef] [PubMed]
  3. W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Power scaling for narrow linewidth C-band pulsed fiber lasers using a highly Er/Yb co-doped phosphate glass fiber," SPIE Photonics West 2008, OPTO, Optical Components and Materials V, 19-24, 6890-20 (2008).
  4. B. Steinhausser1, A. Brignon1, E. Lallier, J. P. Huignard, P. Georges, "High energy, single-mode, narrow-linewidth fiber laser source using stimulated Brillouin scattering beam cleanup," Opt. Express 15, 6464-6469 (2007).
    [CrossRef]
  5. V. Philippov, C. Codemard, Y. Jeong, C. Alegria, J. K. Sahu, and J. Nilsson, "High-energy in-fiber pulse amplification for coherent lidar applications," Opt. Lett. 29, 2590-2592 (2004).
    [CrossRef] [PubMed]
  6. G. P. Agrawal, Nonlinear Fiber Optics, Third Edition, (Academic, 2001).
  7. M.-J. Li, X. Chen, J. Wang, S. Gray, A. Liu, J. A. Demeritt, A. B. Ruffin, A. M. Crowley, D. T. Walton, and L. A. Zenteno, "Al/Ge co-doped large mode area fiber with high SBS threshold," Opt. Express,  15, 8290-8299 (2007).
    [CrossRef]
  8. J. Nilsson, "SBS Suppression at the kilowatt level," SPIE Photonics West 2009, 7195-50.
  9. J. M. Fini, "Bend-resistant design of conventional and microstructure fibers with very large mode area," Opt. Express 14, 69-81 (2006).
    [CrossRef] [PubMed]
  10. V. I. Kovalev and R. G. Harrison, "Suppression of stimulated Brillouin scattering in high-power single-frequency fiber amplifiers," Opt. Lett. 31, 161-163 (2006).
    [CrossRef] [PubMed]
  11. N. G. R. Broderick, H. L. Offerhaus, D. J. Richardson, R. A. Sammut, J. Caplen, and L. Dong, "Large mode area fibers for high power applications," Opt. Fiber Technol. 5, 185-196 (1999).
    [CrossRef]
  12. F. D. Teodoro, J. P. Koplow, S. W. Moore, and D. A. V. Kliner, "Diffraction-limited, 300-kW peak-power pulses from a coiled multimode fiber amplifier," Opt. Lett. 27, 518-520 (2002).
    [CrossRef]
  13. J. M. Fini, "Design of large-mode-area amplifier fibers resistant to bend-induced distortion," J. Opt. Soc. Am. B 24, 1669-1676 (2007).
    [CrossRef]
  14. Y. Kaneda, Y. Hu, C. Spiegelberg, J. Geng, and S. Jiang, "Single-frequency, all-fiber Q-switched laser at 1550-nm," OSA Topical Meeting on Advanced Solid-State Photonics 2004, Postdeadline paper PD5
  15. Y. Kaneda, C. Spiegelberg, J. Geng, and Y. Hu, "All-fiber Q-switched laser, " Patent 7130319, 2006.
  16. W. Shi, M. A. Leigh, J. Zong, Z. Yao, A. Chavez-Pirson and N. Peyghambarian, "High power all fiber-based narrow linewidth single-mode fiber laser pulses in the C-band and frequency conversion to THz generation," IEEE J. Sel. Top. Quantum Electron. 15, 377-384 (2009).
    [CrossRef]
  17. W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Photonic narrow linewidth GHz source based on highly co-doped phosphate glass fiber lasers in a single MOPA chain," IEEE Photon. Technol. Lett. 20, 69-71 (2008).
    [CrossRef]
  18. M. Leigh, W. Shi, J. Zong, Z. Yao, S. Jiang, and N. Peyghambarian, "High peak power single frequency ns pulses using a short phosphate glass fiber with a large core," Appl. Phys. Lett. 92, 181108-181110 (2008).
    [CrossRef]
  19. W. Shi, M. Leigh, J. Zong, and S. Jiang, "Single-frequency THz source pumped by Q-switched fiber lasers based on difference-frequency generation in GaSe crystal," Opt. Lett. 32, 949-951 (2007).
    [CrossRef] [PubMed]
  20. B. Ruffin, M.-J. Li, X. Chen, A. Kobyakov, and F. Annunziata, "Brillouin gain analysis for fibers with different refractive indices," Opt. Lett. 30, 3123-3125 (2005).
    [CrossRef] [PubMed]
  21. N. Peyghambarian and S. Jiang, "Erbium and ytterbium co-doped phosphate glass optical fiber amplifiers using short active fiber length," US Patent, 6611372, Aug 26, 2003.
  22. Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
    [CrossRef]
  23. Y. W. Lee, K. E. Urbanek, M. J. F. Digonnet, R. L. Byer, and S. Jiang, "Measurement of the stimulated Brillouin scattering gain coefficient of a phosphate fibre," Proc. SPIE 6469, 64690L (2007).
    [CrossRef]

2009

W. Shi, M. A. Leigh, J. Zong, Z. Yao, A. Chavez-Pirson and N. Peyghambarian, "High power all fiber-based narrow linewidth single-mode fiber laser pulses in the C-band and frequency conversion to THz generation," IEEE J. Sel. Top. Quantum Electron. 15, 377-384 (2009).
[CrossRef]

2008

W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Photonic narrow linewidth GHz source based on highly co-doped phosphate glass fiber lasers in a single MOPA chain," IEEE Photon. Technol. Lett. 20, 69-71 (2008).
[CrossRef]

M. Leigh, W. Shi, J. Zong, Z. Yao, S. Jiang, and N. Peyghambarian, "High peak power single frequency ns pulses using a short phosphate glass fiber with a large core," Appl. Phys. Lett. 92, 181108-181110 (2008).
[CrossRef]

2007

2006

2005

2004

2002

2001

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

1999

N. G. R. Broderick, H. L. Offerhaus, D. J. Richardson, R. A. Sammut, J. Caplen, and L. Dong, "Large mode area fibers for high power applications," Opt. Fiber Technol. 5, 185-196 (1999).
[CrossRef]

Alegria, C.

Allan, G. R.

Annunziata, F.

Broderick, N. G. R.

N. G. R. Broderick, H. L. Offerhaus, D. J. Richardson, R. A. Sammut, J. Caplen, and L. Dong, "Large mode area fibers for high power applications," Opt. Fiber Technol. 5, 185-196 (1999).
[CrossRef]

Byer, R. L.

Y. W. Lee, K. E. Urbanek, M. J. F. Digonnet, R. L. Byer, and S. Jiang, "Measurement of the stimulated Brillouin scattering gain coefficient of a phosphate fibre," Proc. SPIE 6469, 64690L (2007).
[CrossRef]

Caplen, J.

N. G. R. Broderick, H. L. Offerhaus, D. J. Richardson, R. A. Sammut, J. Caplen, and L. Dong, "Large mode area fibers for high power applications," Opt. Fiber Technol. 5, 185-196 (1999).
[CrossRef]

Chavez-Pirson, A.

W. Shi, M. A. Leigh, J. Zong, Z. Yao, A. Chavez-Pirson and N. Peyghambarian, "High power all fiber-based narrow linewidth single-mode fiber laser pulses in the C-band and frequency conversion to THz generation," IEEE J. Sel. Top. Quantum Electron. 15, 377-384 (2009).
[CrossRef]

Chen, X.

Codemard, C.

Crowley, A. M.

Demeritt, J. A.

Digonnet, M. J. F.

Y. W. Lee, K. E. Urbanek, M. J. F. Digonnet, R. L. Byer, and S. Jiang, "Measurement of the stimulated Brillouin scattering gain coefficient of a phosphate fibre," Proc. SPIE 6469, 64690L (2007).
[CrossRef]

Dilley, C. E.

Dong, L.

N. G. R. Broderick, H. L. Offerhaus, D. J. Richardson, R. A. Sammut, J. Caplen, and L. Dong, "Large mode area fibers for high power applications," Opt. Fiber Technol. 5, 185-196 (1999).
[CrossRef]

Fini, J. M.

Gray, S.

Harrison, R. G.

Honkanen, S.

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

Hu, Y.

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

Jeong, Y.

Jiang, S.

M. Leigh, W. Shi, J. Zong, Z. Yao, S. Jiang, and N. Peyghambarian, "High peak power single frequency ns pulses using a short phosphate glass fiber with a large core," Appl. Phys. Lett. 92, 181108-181110 (2008).
[CrossRef]

W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Photonic narrow linewidth GHz source based on highly co-doped phosphate glass fiber lasers in a single MOPA chain," IEEE Photon. Technol. Lett. 20, 69-71 (2008).
[CrossRef]

W. Shi, M. Leigh, J. Zong, and S. Jiang, "Single-frequency THz source pumped by Q-switched fiber lasers based on difference-frequency generation in GaSe crystal," Opt. Lett. 32, 949-951 (2007).
[CrossRef] [PubMed]

Y. W. Lee, K. E. Urbanek, M. J. F. Digonnet, R. L. Byer, and S. Jiang, "Measurement of the stimulated Brillouin scattering gain coefficient of a phosphate fibre," Proc. SPIE 6469, 64690L (2007).
[CrossRef]

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

Kliner, D. A. V.

Kobyakov, A.

Koplow, J. P.

Kovalev, V. I.

Krainak, M.

Lee, Y. W.

Y. W. Lee, K. E. Urbanek, M. J. F. Digonnet, R. L. Byer, and S. Jiang, "Measurement of the stimulated Brillouin scattering gain coefficient of a phosphate fibre," Proc. SPIE 6469, 64690L (2007).
[CrossRef]

Leigh, M.

M. Leigh, W. Shi, J. Zong, Z. Yao, S. Jiang, and N. Peyghambarian, "High peak power single frequency ns pulses using a short phosphate glass fiber with a large core," Appl. Phys. Lett. 92, 181108-181110 (2008).
[CrossRef]

W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Photonic narrow linewidth GHz source based on highly co-doped phosphate glass fiber lasers in a single MOPA chain," IEEE Photon. Technol. Lett. 20, 69-71 (2008).
[CrossRef]

W. Shi, M. Leigh, J. Zong, and S. Jiang, "Single-frequency THz source pumped by Q-switched fiber lasers based on difference-frequency generation in GaSe crystal," Opt. Lett. 32, 949-951 (2007).
[CrossRef] [PubMed]

Leigh, M. A.

W. Shi, M. A. Leigh, J. Zong, Z. Yao, A. Chavez-Pirson and N. Peyghambarian, "High power all fiber-based narrow linewidth single-mode fiber laser pulses in the C-band and frequency conversion to THz generation," IEEE J. Sel. Top. Quantum Electron. 15, 377-384 (2009).
[CrossRef]

Li, M.-J.

Liu, A.

Lucas, J.

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

Luo, T.

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

Moore, S. W.

Morrell, M.

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

Nilsson, J.

Offerhaus, H. L.

N. G. R. Broderick, H. L. Offerhaus, D. J. Richardson, R. A. Sammut, J. Caplen, and L. Dong, "Large mode area fibers for high power applications," Opt. Fiber Technol. 5, 185-196 (1999).
[CrossRef]

Peyghambarian, N.

W. Shi, M. A. Leigh, J. Zong, Z. Yao, A. Chavez-Pirson and N. Peyghambarian, "High power all fiber-based narrow linewidth single-mode fiber laser pulses in the C-band and frequency conversion to THz generation," IEEE J. Sel. Top. Quantum Electron. 15, 377-384 (2009).
[CrossRef]

M. Leigh, W. Shi, J. Zong, Z. Yao, S. Jiang, and N. Peyghambarian, "High peak power single frequency ns pulses using a short phosphate glass fiber with a large core," Appl. Phys. Lett. 92, 181108-181110 (2008).
[CrossRef]

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

Philippov, V.

Richardson, D. J.

N. G. R. Broderick, H. L. Offerhaus, D. J. Richardson, R. A. Sammut, J. Caplen, and L. Dong, "Large mode area fibers for high power applications," Opt. Fiber Technol. 5, 185-196 (1999).
[CrossRef]

Riris, H.

Ruffin, A. B.

Ruffin, B.

Sahu, J. K.

Sammut, R. A.

N. G. R. Broderick, H. L. Offerhaus, D. J. Richardson, R. A. Sammut, J. Caplen, and L. Dong, "Large mode area fibers for high power applications," Opt. Fiber Technol. 5, 185-196 (1999).
[CrossRef]

Savage-Leuchs, M. P.

Seneschal, K.

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

Shi, W.

W. Shi, M. A. Leigh, J. Zong, Z. Yao, A. Chavez-Pirson and N. Peyghambarian, "High power all fiber-based narrow linewidth single-mode fiber laser pulses in the C-band and frequency conversion to THz generation," IEEE J. Sel. Top. Quantum Electron. 15, 377-384 (2009).
[CrossRef]

M. Leigh, W. Shi, J. Zong, Z. Yao, S. Jiang, and N. Peyghambarian, "High peak power single frequency ns pulses using a short phosphate glass fiber with a large core," Appl. Phys. Lett. 92, 181108-181110 (2008).
[CrossRef]

W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Photonic narrow linewidth GHz source based on highly co-doped phosphate glass fiber lasers in a single MOPA chain," IEEE Photon. Technol. Lett. 20, 69-71 (2008).
[CrossRef]

W. Shi, M. Leigh, J. Zong, and S. Jiang, "Single-frequency THz source pumped by Q-switched fiber lasers based on difference-frequency generation in GaSe crystal," Opt. Lett. 32, 949-951 (2007).
[CrossRef] [PubMed]

Smektala, F.

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

Steinhausser, B.

Stephen, M.

Stephen, M. A.

Teodoro, F. D.

Urbanek, K. E.

Y. W. Lee, K. E. Urbanek, M. J. F. Digonnet, R. L. Byer, and S. Jiang, "Measurement of the stimulated Brillouin scattering gain coefficient of a phosphate fibre," Proc. SPIE 6469, 64690L (2007).
[CrossRef]

Walton, D. T.

Wang, J.

Yao, Z.

W. Shi, M. A. Leigh, J. Zong, Z. Yao, A. Chavez-Pirson and N. Peyghambarian, "High power all fiber-based narrow linewidth single-mode fiber laser pulses in the C-band and frequency conversion to THz generation," IEEE J. Sel. Top. Quantum Electron. 15, 377-384 (2009).
[CrossRef]

M. Leigh, W. Shi, J. Zong, Z. Yao, S. Jiang, and N. Peyghambarian, "High peak power single frequency ns pulses using a short phosphate glass fiber with a large core," Appl. Phys. Lett. 92, 181108-181110 (2008).
[CrossRef]

W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Photonic narrow linewidth GHz source based on highly co-doped phosphate glass fiber lasers in a single MOPA chain," IEEE Photon. Technol. Lett. 20, 69-71 (2008).
[CrossRef]

Zenteno, L. A.

Zong, J.

W. Shi, M. A. Leigh, J. Zong, Z. Yao, A. Chavez-Pirson and N. Peyghambarian, "High power all fiber-based narrow linewidth single-mode fiber laser pulses in the C-band and frequency conversion to THz generation," IEEE J. Sel. Top. Quantum Electron. 15, 377-384 (2009).
[CrossRef]

M. Leigh, W. Shi, J. Zong, Z. Yao, S. Jiang, and N. Peyghambarian, "High peak power single frequency ns pulses using a short phosphate glass fiber with a large core," Appl. Phys. Lett. 92, 181108-181110 (2008).
[CrossRef]

W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Photonic narrow linewidth GHz source based on highly co-doped phosphate glass fiber lasers in a single MOPA chain," IEEE Photon. Technol. Lett. 20, 69-71 (2008).
[CrossRef]

W. Shi, M. Leigh, J. Zong, and S. Jiang, "Single-frequency THz source pumped by Q-switched fiber lasers based on difference-frequency generation in GaSe crystal," Opt. Lett. 32, 949-951 (2007).
[CrossRef] [PubMed]

Appl. Phys. Lett.

M. Leigh, W. Shi, J. Zong, Z. Yao, S. Jiang, and N. Peyghambarian, "High peak power single frequency ns pulses using a short phosphate glass fiber with a large core," Appl. Phys. Lett. 92, 181108-181110 (2008).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron.

W. Shi, M. A. Leigh, J. Zong, Z. Yao, A. Chavez-Pirson and N. Peyghambarian, "High power all fiber-based narrow linewidth single-mode fiber laser pulses in the C-band and frequency conversion to THz generation," IEEE J. Sel. Top. Quantum Electron. 15, 377-384 (2009).
[CrossRef]

IEEE Photon. Technol. Lett.

W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Photonic narrow linewidth GHz source based on highly co-doped phosphate glass fiber lasers in a single MOPA chain," IEEE Photon. Technol. Lett. 20, 69-71 (2008).
[CrossRef]

Y. Hu, S. Jiang, T. Luo, K. Seneschal, M. Morrell, F. Smektala, S. Honkanen, J. Lucas, and N. Peyghambarian, "Performance of high-concentration Er3+-Yb3+-codoped phosphate fiber amplifiers," IEEE Photon. Technol. Lett. 13, 657-659 (2001).
[CrossRef]

J. Opt. Soc. Am. B

Opt. Express

Opt. Fiber Technol.

N. G. R. Broderick, H. L. Offerhaus, D. J. Richardson, R. A. Sammut, J. Caplen, and L. Dong, "Large mode area fibers for high power applications," Opt. Fiber Technol. 5, 185-196 (1999).
[CrossRef]

Opt. Lett.

Proc. SPIE

Y. W. Lee, K. E. Urbanek, M. J. F. Digonnet, R. L. Byer, and S. Jiang, "Measurement of the stimulated Brillouin scattering gain coefficient of a phosphate fibre," Proc. SPIE 6469, 64690L (2007).
[CrossRef]

Other

N. Peyghambarian and S. Jiang, "Erbium and ytterbium co-doped phosphate glass optical fiber amplifiers using short active fiber length," US Patent, 6611372, Aug 26, 2003.

W. Shi, M. Leigh, J. Zong, Z. Yao, and S. Jiang, "Power scaling for narrow linewidth C-band pulsed fiber lasers using a highly Er/Yb co-doped phosphate glass fiber," SPIE Photonics West 2008, OPTO, Optical Components and Materials V, 19-24, 6890-20 (2008).

G. P. Agrawal, Nonlinear Fiber Optics, Third Edition, (Academic, 2001).

J. Nilsson, "SBS Suppression at the kilowatt level," SPIE Photonics West 2009, 7195-50.

Y. Kaneda, Y. Hu, C. Spiegelberg, J. Geng, and S. Jiang, "Single-frequency, all-fiber Q-switched laser at 1550-nm," OSA Topical Meeting on Advanced Solid-State Photonics 2004, Postdeadline paper PD5

Y. Kaneda, C. Spiegelberg, J. Geng, and Y. Hu, "All-fiber Q-switched laser, " Patent 7130319, 2006.

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Figures (9)

Fig. 1.
Fig. 1.

(a).Pulse width variation with the repetition rate with pump power of 500 mW for 1550 nm fiber laser pulses, and (b) the pulse width variation with the pump power at a repetition rate of 20 kHz with the 1538 nm fiber laser pulses.

Fig. 2.
Fig. 2.

The typical pulse shapes of the Q-switched fiber lasers with different pulse widths.

Fig. 3.
Fig. 3.

Measured optical spectrum for the for the Q-switched fiber laser at 1538 nm

Fig. 4.
Fig. 4.

Fabry-Perot scanning spectra of Q-switched fiber laser for (a) 7.6 ns pulses and (b) 112 ns pulses, and (c) estimated linewidths for Q-switched fiber laser pulses with different durations and the Gaussian transform-limited fitting.

Fig. 5.
Fig. 5.

Schematic of the SM single-frequency Q-switched fiber laser in MOPA.

Fig. 6.
Fig. 6.

Fusion splice processing of LC-EYPhF with commercial silica fiber

Fig. 7.
Fig. 7.

(a). Pulse energy vs. power amplifier pump power for the MOPA system at ~ 1538 nm. (b). Typical pulse shape for the amplified 54 μJ pulses.

Fig. 8.
Fig. 8.

(a). and (b). the images of the pulsed fiber laser profile displayed in 2D and 3D views for 54 μJ pulses; (c) Beam quality evaluation by measuring M2 values at two orthogonal directions by scanning the beam size around the waist position of the focused propagation beam.

Fig. 9.
Fig. 9.

(a). the spectral trace for 54 μJ pulses with 153 ns duration at 20 kHz repetition rate using an optical spectrum analyzer with a resolution of 0.06 nm; (b) the F-P scanning spectrum for 54 μJ pulses.

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