Abstract

A single-longitudinal-mode Ho:YAG laser with a twisted-mode cavity under the continuous-wave and pulsed operation was demonstrated. The maximum continuous-wave single-longitudinal-mode output power of 0.76 W was obtained at the wavelength of 2097.46 nm, corresponding to a slope efficiency of 28.9%. The output wavelength was tuned from 2096.94 nm to 2098.48 nm by utilizing a 0.5-mm-thick etalon. Furthermore, the single-frequency pulsed operation of the twisted-mode Ho:YAG laser was realized by the electro-optic switch. For the 2 kHz pulse repetition frequency, the single-frequency pulse energy reached 0.2 mJ with the pulse width of 116.5 ns. The beam quality factors M2 of the pulsed twisted-mode Ho:YAG laser in the x and y directions were 1.15 and 1.10, respectively.

© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

1. Introduction

2 µm eye-safe single-longitudinal-mode solid-state lasers have been paid widespread attention in different kinds of application fields, including lidar system [13], high resolution spectroscopy [4] and pumping source of the molecular lasers [5]. Benefitting from large emission cross section, insensitivity to temperature and low quantum defect, pumping directly the Ho-doped media through the 1.9 µm Tm doped solid-state or fiber lasers is a fundamental approach to generate the 2 µm high power laser [6,7]. Usually, the 2 µm single-longitudinal-mode Ho-doped lasers are achieved by some techniques, such as the lasers with intra-cavity etalons or gratings, the ring lasers based on Faraday effect or acousto-optic effect and the nonplanar ring oscillators (NPROs). In 2017, Li et al. proposed a tunable Ho:YAG single-longitudinal-mode laser by utilizing a 1.13 µm laser diode as the pump source. [8]. Up to 102 mW single-longitudinal-mode output power at 2129.6 nm was obtained by inserting two intra-cavity etalons. In 2017, based on Faraday effect, Wu et al. demonstrated a single-longitudinal-mode Ho:YLF unidirectional ring laser [9]. The maximum single-longitudinal-mode output power of 528 mW at 2051.65 nm was obtained, with a slope efficiency of 39.5%. In 2013, Wang et al. reported a monolithic Ho:YAG NPRO at 2122 nm by using a Tm:YLF solid-state laser as the pump source [10]. The maximum single-longitudinal-mode output power was 8 W, corresponding to a slope efficiency of 61.4%.

Among the different Ho-doped single-longitudinal-mode lasers, the lasers with intra-cavity etalons do not have the capability to obtain single-longitudinal-mode laser with higher power. In terms of isotropic Ho:YAG crystal, the monolithic NPRO is an efficient technique to realize 2 µm high power single-longitudinal-mode laser. However, the construction of the NPRO is too complex to be machined. In addition, the unidirectional Ho-doped ring laser based on Faraday effect or acousto-optic effect is another method to obtain single-longitudinal-mode laser with high power. Nevertheless, the unidirectional single-longitudinal-mode ring laser calls for long physics cavity length for inserting a Faraday rotator or an acousto-optic modulator into the resonant cavity, leading to the relatively large volume.

Compared with other techniques mentioned above, the twisted-mode laser is uncomplicated and easy to achieve continuous-wave or pulsed single-longitudinal-mode operation. In 2015, Cong et al. reported a Nd:YAG twisted-mode laser pumped by a laser diode [11]. Up to 2.6 W single-longitudinal-mode output power at the wavelength of 1064.48 nm was realized, with an optical-to-optical conversion efficiency of 21.5%. Moreover, the pulsed single-frequency laser output was obtained by employing an RbTiOPO4 (RTP) electro-optic crystal. At the pump power of 7.5 W, the single-frequency pulsed energy of 119 µJ at the pulse repetition frequency of 10 kHz was achieved with a pulsed width of 47.6 ns. In 2015, by using a twisted-mode cavity, Yao et al. proposed a tunable Er:YAG single-longitudinal-mode laser with a laser diode as the pumping source [12]. The maximum single-longitudinal-mode output power reached 315 mW at the wavelength of 1645.3 nm, with a slope efficiency of 7.7%. In 2012, Gao et al. reported a 2 µm single-longitudinal-mode Tm:YAG laser with a L-shaped twisted-mode cavity [13]. The maximum single-longitudinal-mode output power was 1.46 W, corresponding to a slope efficiency of 19.2%. However, the twisted-mode laser based on the Ho-doped medium in the 2 µm spectral domain has not been reported yet.

In this paper, we presented the continuous-wave and pulsed single-longitudinal-mode laser characteristics of a twisted-mode Ho:YAG laser. At the continuous-wave operation, up to 0.76 W single-longitudinal-mode output power was obtained at the wavelength of 2097.46 nm, corresponding to a slope efficiency of 28.9%. The output wavelength was tuned from 2096.94 nm to 2098.48 nm by adjusting the angle of the 0.5-mm-thick etalon in the Ho:YAG twisted-mode resonant cavity. At the pulsed single-frequency operation of 2 kHz, the maximum pulsed energy of 0.2 mJ was achieved with a pulse width of 116.5 ns. To our knowledge, it is the first time to report a tunable single-longitudinal-mode Ho:YAG laser based on a twisted-mode resonant cavity.

2. Experimental setup

The experimental setup of the twisted-mode Ho:YAG laser is illustrated in Fig. 1. A Tm:YLF solid-state laser at the central wavelength of 1908nm, with the maximum output power of 20 W and M2 factor of about 1.5 was considered as the pumping source. A Φ4×50 mm3 Ho:YAG gain medium was doped with 0.5 at.% Ho3+ concentration, and wrapped by indium foil and fixed on a copper heat sink, which was maintained at 15°C by a thermoelectric cooler (TEC). The spot radius of the pump light was approximately 320 µm in the center of the Ho:YAG crystal, which was focused by a positive lens f1 with the focal length of 150 mm. M1 was a 45° flat mirror coated with high reflectivity at 1.9 µm pump light. P1 was a polarizer coated with high reflectivity at 1.9 µm pump light, high reflectivity at 2.09 µm s-polarized light and high transmission at 2.09 µm p-polarized light. The polarizer P1 was used to make sure that the p-polarized light oscillated in the Ho:YAG twisted-mode cavity. M2 was a 0° flat mirror coated with high transmission at 1.9 µm pump light and high reflectivity at 2.09 µm resonant light. M3 was a plano-concave output coupler with a curvature radius of 300 mm and a transmission of 30% at 2.09 µm resonant light. The twisted-mode laser had a physical cavity length of about 180 mm. To obtain the single-longitudinal-mode operation of the twisted-mode Ho:YAG laser, a pair of 2.09 µm zero-order quarter wave plates (QWPs) with their orthogonal fast axes oriented at 45° to the resonant light were placed on both sides of the Ho:YAG crystal to ensure that the circularly polarized light oscillates in the Ho:YAG crystal, which leads to the elimination of spatial hole-burning effect. Moreover, an electro-optic Q-switching was used to achieve pulsed single-frequency Ho:YAG laser output. The voltage-increased electro-optic Q-switching was composed of two 3×3×10 mm3 RTP crystals. The fast axis of the QWP3 was oriented at 45° to the resonant light. Consequently, the laser at p-polarized was changed to s-polarized after passing through the QWP3 twice when there was no voltage applied on the RTP crystal, leading to a high loss. When the quarter-wave voltage was applied on the RTP crystal, the single-frequency pulsed laser was obtained.

 figure: Fig. 1.

Fig. 1. The experimental setup of the twisted-mode Ho:YAG laser.

Download Full Size | PPT Slide | PDF

3. Experimental results

The continuous-wave single-longitudinal-mode output power of the Ho:YAG twisted-mode laser as a function of the pump power is shown in Fig. 2. Under the pump power of 8 W, the maximum single-longitudinal-mode output power reached 0.76 W, corresponding to a slope efficiency of 28.9%. As shown in Fig. 3(a), the output wavelength of the continuous-wave twisted-mode Ho:YAG laser measured by a wavelength meter (Bristol 721A) was centered at 2097.46 nm. The typical Fabry-Perot (F-P) spectra recorded by a confocal scanned F-P interferometer (THORLABS, SA200-18B) with a free spectral range (FSR) of 1.5 GHz are shown in Fig. 3(b). From the scanning F-P spectra, there were no other longitudinal modes, indicating that the twisted-mode Ho:YAG laser was in the single-longitudinal-mode operation.

 figure: Fig. 2.

Fig. 2. The single-longitudinal-mode output power of the continuous-wave Ho:YAG twisted-mode laser as a function of the pump power.

Download Full Size | PPT Slide | PDF

 figure: Fig. 3.

Fig. 3. Laser properties of the continuous-wave single-longitudinal-mode Ho:YAG laser. (a) Output wavelength and (b) F-P scanning spectra.

Download Full Size | PPT Slide | PDF

A 0.5-mm-thick YAG etalon without coating was inserted into the resonant cavity to tune the output wavelength of the continuous-wave single-longitudinal-mode Ho:YAG laser with a twisted-mode cavity. Under the pump power of 8 W, the single-longitudinal-mode wavelength was tuned from 2096.94 nm to 2098.48 nm (in accord with a FSR of the etalon) by changing the angle of the etalon. The single-longitudinal-mode output power at different wavelength was also measured, as illustrated in Table 1. The output power of 642 mW was obtained at the wavelength of 2097.07 nm.

Tables Icon

Table 1. Relationship between tunable single-longitudinal-mode wavelength and output power.

In addition, we investigated the output characteristics of pulsed single-frequency twisted-mode Ho:YAG laser. The output energy of the pulsed single-frequency laser at different pulse repetition frequency is shown in Fig. 4(a). Under the same pulse repetition frequency, the output energy increased with the pump power. Nevertheless, the continuous-wave and pulsed Ho:YAG twisted-mode laser operated in multi longitudinal mode when the pump power was above 8 W. This phenomenon might be caused by that the polarization state of resonant light in the twisted-mode cavity was changed from the potential thermal induced birefringence of the Ho:YAG crystal at high pumping level. At the pump power of 8 W, the single-frequency output energy was 0.2 mJ at the pulse repetition frequency of 2 kHz. The output energy decreased to 48.6 µJ when the pulse repetition frequency increased from 2 kHz to 10 kHz. The pulse widths at the pulse repetition frequency of 2 kHz, 5 kHz and 10 kHz monitored by a high-speed InGaAs detector are illustrated in Fig. 4(b). With the increasing of pump power, the pulse width became narrower at the same pulse repetition frequency. Under the pulse repetition frequency of 2 kHz and pump power of 8 W, the pulse width was 116.5 ns.

 figure: Fig. 4.

Fig. 4. Lasing performance of the pulsed single-frequency Ho:YAG laser. (a) Output energy and (b) Pulse width.

Download Full Size | PPT Slide | PDF

The temporal shapes and their fast Fourier transform (FFT) curves of the pulsed Ho:YAG laser were recorded by an InGaAs detector connected to a digital oscilloscope, as shown in Fig. 5. In the free-running mode (without QWP1 and QWP2), the mode beating is observed from Fig. 5(a) due to the multi-longitudinal-mode operation. The interval of about 620 MHz between adjacent beating signals in Fig. 5(a) was smaller than that of the FSR corresponding to the physics cavity length of the Ho:YAG twisted-mode laser because the optical cavity length was increased by the refractive index of Ho:YAG and RTP crystal. Compared with the free-running mode, the typical temporal shapes and FFT curves of the pulsed single-frequency twisted-mode Ho:YAG laser is shown in Fig. 5(b). There were no mode beating spikes and the temporal pulse shape was smooth, which indicated that the pulsed twisted-mode Ho:YAG laser operated in single longitudinal mode.

 figure: Fig. 5.

Fig. 5. The temporal shapes of the Ho:YAG twisted-mode laser. (a) At the free-running operation and (b) At the single-longitudinal-mode operation.

Download Full Size | PPT Slide | PDF

In order to obtain the beam quality factors of the pulsed twisted-mode Ho:YAG laser, a positive lens with the focal length of 100 mm was positioned approximately 150 mm from the output coupler. At the highest single-frequency output energy, the horizontal and vertical laser spot radii along the propagation direction were measured by the 90/10 knife-edge technique, as illustrated in Fig. 6. By fitting the standard Gaussian beam propagation expression to the experimental data, the M2 factors in the x and y directions were 1.15 and 1.10, respectively.

 figure: Fig. 6.

Fig. 6. The beam quality of the pulsed single-frequency Ho: YAG twisted-mode laser.

Download Full Size | PPT Slide | PDF

4. Conclusion

In summary, we demonstrated the continuous-wave and electro-optic Q-switched operation of the Ho:YAG laser with a twisted-mode cavity. Under the pump power of 8 W, the maximum continuous-wave single-longitudinal-mode output power was 0.76 W, with a slope efficiency of 28.9%. The output wavelength was tuned from 2096.94 nm to 2098.48 nm by inserting a 0.5-mm-thick etalon into the Ho:YAG twisted-mode resonant cavity. For the voltage-increased Q-switched operation, the output energy of the pulsed single-frequency twisted-mode Ho:YAG laser was 0.2 mJ at the pulse repetition frequency of 2 kHz, corresponding to a pulse width of 116.5 ns. The M2 factors of the pulsed twisted-mode Ho:YAG laser in the x and y directions were 1.15 and 1.10, respectively.

Funding

National Natural Science Foundation of China (51572053).

Disclosures

The authors declare no conflicts of interest.

References

1. K. Scholle, E. Heumann, and G. Huber, “Single mode Tm and Tm, Ho: LuAG lasers for LIDAR applications,” Laser Phys. Lett. 1(6), 285–290 (2004). [CrossRef]  

2. F. Gibert, D. Edouart, C. Cénac, and F. Le Mounier, “2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application,” Appl. Phys. B 116(4), 967–976 (2014). [CrossRef]  

3. G. J. Koch, B. W. Barnes, M. Petros, J. Y. Beyon, F. Amzajerdian, J. Yu, R. E. Davis, S. Ismail, S. Vay, M. J. Kavaya, and U. N. Singh, “Coherent differential absorption lidar measurements of CO2,” Appl. Opt. 43(26), 5092–5099 (2004). [CrossRef]  

4. J. Li, S. H. Yang, C. M. Zhao, H. Y. Zhang, and W. Xie, “High efficient single-frequency output at 1991nm from a diode-pumped Tm:YAP coupled cavity,” Opt. Express 18(12), 12161–12167 (2010). [CrossRef]  

5. L. R. Botha, C. Bollig, M. J. D. Esser, R. N. Campbell, C. Jacobs, and D. R. Preussler, “Ho:YLF pumped HBr laser,” Opt. Express 17(22), 20615–20622 (2009). [CrossRef]  

6. T. Y. Dai, Y. L. Ju, B. Q. Yao, Y. J. Shen, W. Wang, and Y. Z. Wang, “Single-frequency, Q-switched Ho:YAG laser at room temperature injection-seeded by two F-P etalons-restricted Tm, Ho:YAG laser,” Opt. Lett. 37(11), 1850–1852 (2012). [CrossRef]  

7. H. J. Strauss, W. Koen, C. Bollig, M. J. D. Esser, C. Jacobs, O. J. P. Collett, and D. R. Preussler, “Ho:YLF & Ho:LuLF slab amplifier system delivering 200 mJ, 2 µm single-frequency pulses,” Opt. Express 19(15), 13974–13979 (2011). [CrossRef]  

8. W. J. Li, C. Q. Wang, Y. L. Wang, Y. L. Wang, and C. Q. Gao, “Tunable single-longitudinal-mode Ho:YAG laser pumped by a 1.13 µm diode laser,” Appl. Opt. 56(35), 9809–9813 (2017). [CrossRef]  

9. J. Wu, Y. L. Ju, T. Y. Dai, B. Q. Yao, and Y. Z. Wang, “1.5 W high efficiency and tunable single-longitudinal-mode Ho:YLF ring laser based on Faraday effect,” Opt. Express 25(22), 27671–27677 (2017). [CrossRef]  

10. L. Wang, C. Q. Gao, M. W. Gao, and Y. Li, “Resonantly pumped monolithic nonplanar Ho:YAG ring laser with high-power single frequency laser output at 2122 nm,” Opt. Express 21(8), 9541–9546 (2013). [CrossRef]  

11. Z. H. Cong, Z. J. Liu, Z. G. Qin, X. Y. Zhang, S. W. Wang, H. Rao, and Q. Fu, “RTP Q-switched single-longitudinal-mode Nd:YAG laser with a twisted-mode cavity,” Appl. Opt. 54(16), 5143–5146 (2015). [CrossRef]  

12. B. Q. Yao, T. Y. Dai, X. M. Deng, Y. L. Duan, Y. Z. Ju, and Wang, “Tunable single-longitudinal-mode Er:YAG laser using a twisted-mode technique at 1.6µm,” Laser Phys. Lett. 12(2), 025004 (2015). [CrossRef]  

13. C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012). [CrossRef]  

References

  • View by:

  1. K. Scholle, E. Heumann, and G. Huber, “Single mode Tm and Tm, Ho: LuAG lasers for LIDAR applications,” Laser Phys. Lett. 1(6), 285–290 (2004).
    [Crossref]
  2. F. Gibert, D. Edouart, C. Cénac, and F. Le Mounier, “2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application,” Appl. Phys. B 116(4), 967–976 (2014).
    [Crossref]
  3. G. J. Koch, B. W. Barnes, M. Petros, J. Y. Beyon, F. Amzajerdian, J. Yu, R. E. Davis, S. Ismail, S. Vay, M. J. Kavaya, and U. N. Singh, “Coherent differential absorption lidar measurements of CO2,” Appl. Opt. 43(26), 5092–5099 (2004).
    [Crossref]
  4. J. Li, S. H. Yang, C. M. Zhao, H. Y. Zhang, and W. Xie, “High efficient single-frequency output at 1991nm from a diode-pumped Tm:YAP coupled cavity,” Opt. Express 18(12), 12161–12167 (2010).
    [Crossref]
  5. L. R. Botha, C. Bollig, M. J. D. Esser, R. N. Campbell, C. Jacobs, and D. R. Preussler, “Ho:YLF pumped HBr laser,” Opt. Express 17(22), 20615–20622 (2009).
    [Crossref]
  6. T. Y. Dai, Y. L. Ju, B. Q. Yao, Y. J. Shen, W. Wang, and Y. Z. Wang, “Single-frequency, Q-switched Ho:YAG laser at room temperature injection-seeded by two F-P etalons-restricted Tm, Ho:YAG laser,” Opt. Lett. 37(11), 1850–1852 (2012).
    [Crossref]
  7. H. J. Strauss, W. Koen, C. Bollig, M. J. D. Esser, C. Jacobs, O. J. P. Collett, and D. R. Preussler, “Ho:YLF & Ho:LuLF slab amplifier system delivering 200 mJ, 2 µm single-frequency pulses,” Opt. Express 19(15), 13974–13979 (2011).
    [Crossref]
  8. W. J. Li, C. Q. Wang, Y. L. Wang, Y. L. Wang, and C. Q. Gao, “Tunable single-longitudinal-mode Ho:YAG laser pumped by a 1.13 µm diode laser,” Appl. Opt. 56(35), 9809–9813 (2017).
    [Crossref]
  9. J. Wu, Y. L. Ju, T. Y. Dai, B. Q. Yao, and Y. Z. Wang, “1.5 W high efficiency and tunable single-longitudinal-mode Ho:YLF ring laser based on Faraday effect,” Opt. Express 25(22), 27671–27677 (2017).
    [Crossref]
  10. L. Wang, C. Q. Gao, M. W. Gao, and Y. Li, “Resonantly pumped monolithic nonplanar Ho:YAG ring laser with high-power single frequency laser output at 2122 nm,” Opt. Express 21(8), 9541–9546 (2013).
    [Crossref]
  11. Z. H. Cong, Z. J. Liu, Z. G. Qin, X. Y. Zhang, S. W. Wang, H. Rao, and Q. Fu, “RTP Q-switched single-longitudinal-mode Nd:YAG laser with a twisted-mode cavity,” Appl. Opt. 54(16), 5143–5146 (2015).
    [Crossref]
  12. B. Q. Yao, T. Y. Dai, X. M. Deng, Y. L. Duan, Y. Z. Ju, and Wang, “Tunable single-longitudinal-mode Er:YAG laser using a twisted-mode technique at 1.6µm,” Laser Phys. Lett. 12(2), 025004 (2015).
    [Crossref]
  13. C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
    [Crossref]

2017 (2)

2015 (2)

Z. H. Cong, Z. J. Liu, Z. G. Qin, X. Y. Zhang, S. W. Wang, H. Rao, and Q. Fu, “RTP Q-switched single-longitudinal-mode Nd:YAG laser with a twisted-mode cavity,” Appl. Opt. 54(16), 5143–5146 (2015).
[Crossref]

B. Q. Yao, T. Y. Dai, X. M. Deng, Y. L. Duan, Y. Z. Ju, and Wang, “Tunable single-longitudinal-mode Er:YAG laser using a twisted-mode technique at 1.6µm,” Laser Phys. Lett. 12(2), 025004 (2015).
[Crossref]

2014 (1)

F. Gibert, D. Edouart, C. Cénac, and F. Le Mounier, “2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application,” Appl. Phys. B 116(4), 967–976 (2014).
[Crossref]

2013 (1)

2012 (2)

T. Y. Dai, Y. L. Ju, B. Q. Yao, Y. J. Shen, W. Wang, and Y. Z. Wang, “Single-frequency, Q-switched Ho:YAG laser at room temperature injection-seeded by two F-P etalons-restricted Tm, Ho:YAG laser,” Opt. Lett. 37(11), 1850–1852 (2012).
[Crossref]

C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
[Crossref]

2011 (1)

2010 (1)

2009 (1)

2004 (2)

Amzajerdian, F.

Barnes, B. W.

Beyon, J. Y.

Bollig, C.

Botha, L. R.

Campbell, R. N.

Cénac, C.

F. Gibert, D. Edouart, C. Cénac, and F. Le Mounier, “2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application,” Appl. Phys. B 116(4), 967–976 (2014).
[Crossref]

Collett, O. J. P.

Cong, Z. H.

Dai, T. Y.

Davis, R. E.

Deng, X. M.

B. Q. Yao, T. Y. Dai, X. M. Deng, Y. L. Duan, Y. Z. Ju, and Wang, “Tunable single-longitudinal-mode Er:YAG laser using a twisted-mode technique at 1.6µm,” Laser Phys. Lett. 12(2), 025004 (2015).
[Crossref]

Duan, Y. L.

B. Q. Yao, T. Y. Dai, X. M. Deng, Y. L. Duan, Y. Z. Ju, and Wang, “Tunable single-longitudinal-mode Er:YAG laser using a twisted-mode technique at 1.6µm,” Laser Phys. Lett. 12(2), 025004 (2015).
[Crossref]

Edouart, D.

F. Gibert, D. Edouart, C. Cénac, and F. Le Mounier, “2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application,” Appl. Phys. B 116(4), 967–976 (2014).
[Crossref]

Esser, M. J. D.

Fu, Q.

Gao, C.

C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
[Crossref]

Gao, C. Q.

Gao, M.

C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
[Crossref]

Gao, M. W.

Gibert, F.

F. Gibert, D. Edouart, C. Cénac, and F. Le Mounier, “2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application,” Appl. Phys. B 116(4), 967–976 (2014).
[Crossref]

Heumann, E.

K. Scholle, E. Heumann, and G. Huber, “Single mode Tm and Tm, Ho: LuAG lasers for LIDAR applications,” Laser Phys. Lett. 1(6), 285–290 (2004).
[Crossref]

Huber, G.

K. Scholle, E. Heumann, and G. Huber, “Single mode Tm and Tm, Ho: LuAG lasers for LIDAR applications,” Laser Phys. Lett. 1(6), 285–290 (2004).
[Crossref]

Ismail, S.

Jacobs, C.

Ju, Y. L.

Ju, Y. Z.

B. Q. Yao, T. Y. Dai, X. M. Deng, Y. L. Duan, Y. Z. Ju, and Wang, “Tunable single-longitudinal-mode Er:YAG laser using a twisted-mode technique at 1.6µm,” Laser Phys. Lett. 12(2), 025004 (2015).
[Crossref]

Kavaya, M. J.

Koch, G. J.

Koen, W.

Le Mounier, F.

F. Gibert, D. Edouart, C. Cénac, and F. Le Mounier, “2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application,” Appl. Phys. B 116(4), 967–976 (2014).
[Crossref]

Li, J.

Li, W. J.

Li, Y.

Lin, Z.

C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
[Crossref]

Liu, Z. J.

Petros, M.

Preussler, D. R.

Qin, Z. G.

Rao, H.

Scholle, K.

K. Scholle, E. Heumann, and G. Huber, “Single mode Tm and Tm, Ho: LuAG lasers for LIDAR applications,” Laser Phys. Lett. 1(6), 285–290 (2004).
[Crossref]

Shen, Y. J.

Singh, U. N.

Strauss, H. J.

Vay, S.

Wang,

B. Q. Yao, T. Y. Dai, X. M. Deng, Y. L. Duan, Y. Z. Ju, and Wang, “Tunable single-longitudinal-mode Er:YAG laser using a twisted-mode technique at 1.6µm,” Laser Phys. Lett. 12(2), 025004 (2015).
[Crossref]

Wang, C. Q.

Wang, L.

Wang, R.

C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
[Crossref]

Wang, S. W.

Wang, W.

Wang, Y. L.

Wang, Y. Z.

Wu, J.

Xie, W.

Yang, S. H.

Yao, B. Q.

Yu, J.

Zhang, H. Y.

Zhang, X. Y.

Zhang, Y.

C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
[Crossref]

Zhao, C. M.

Zheng, Y.

C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
[Crossref]

Zhu, L.

C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
[Crossref]

Appl. Opt. (3)

Appl. Phys. B (2)

C. Gao, R. Wang, Z. Lin, M. Gao, L. Zhu, Y. Zheng, and Y. Zhang, “2 µm single-frequency Tm:YAG laser generated from a diode-pumped L-shaped twisted mode cavity,” Appl. Phys. B 107(1), 67–70 (2012).
[Crossref]

F. Gibert, D. Edouart, C. Cénac, and F. Le Mounier, “2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application,” Appl. Phys. B 116(4), 967–976 (2014).
[Crossref]

Laser Phys. Lett. (2)

K. Scholle, E. Heumann, and G. Huber, “Single mode Tm and Tm, Ho: LuAG lasers for LIDAR applications,” Laser Phys. Lett. 1(6), 285–290 (2004).
[Crossref]

B. Q. Yao, T. Y. Dai, X. M. Deng, Y. L. Duan, Y. Z. Ju, and Wang, “Tunable single-longitudinal-mode Er:YAG laser using a twisted-mode technique at 1.6µm,” Laser Phys. Lett. 12(2), 025004 (2015).
[Crossref]

Opt. Express (5)

Opt. Lett. (1)

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (6)

Fig. 1.
Fig. 1. The experimental setup of the twisted-mode Ho:YAG laser.
Fig. 2.
Fig. 2. The single-longitudinal-mode output power of the continuous-wave Ho:YAG twisted-mode laser as a function of the pump power.
Fig. 3.
Fig. 3. Laser properties of the continuous-wave single-longitudinal-mode Ho:YAG laser. (a) Output wavelength and (b) F-P scanning spectra.
Fig. 4.
Fig. 4. Lasing performance of the pulsed single-frequency Ho:YAG laser. (a) Output energy and (b) Pulse width.
Fig. 5.
Fig. 5. The temporal shapes of the Ho:YAG twisted-mode laser. (a) At the free-running operation and (b) At the single-longitudinal-mode operation.
Fig. 6.
Fig. 6. The beam quality of the pulsed single-frequency Ho: YAG twisted-mode laser.

Tables (1)

Tables Icon

Table 1. Relationship between tunable single-longitudinal-mode wavelength and output power.

Metrics