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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 16 — Jul. 30, 2012
  • pp: 18230–18237
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Tunable GHz pulse repetition rate operation in high-power TEM00-mode Nd:YLF lasers at 1047 nm and 1053 nm with self mode locking

Y. J. Huang, Y. S. Tzeng, C. Y. Tang, Y. P. Huang, and Y. F. Chen  »View Author Affiliations


Optics Express, Vol. 20, Issue 16, pp. 18230-18237 (2012)
http://dx.doi.org/10.1364/OE.20.018230


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Abstract

We report on a high-power diode-pumped self-mode-locked Nd:YLF laser with the pulse repetition rate up to several GHz. A novel tactic is developed to efficiently select the output polarization state for achieving the stable TEM00-mode self-mode-locked operations at 1053 nm and 1047 nm, respectively. At an incident pump power of 6.93 W and a pulse repetition rate of 2.717 GHz, output powers as high as 2.15 W and 1.35 W are generated for the σ- and π-polarization, respectively. We experimentally find that decreasing the separation between the gain medium and the input mirror not only brings in the pulse shortening thanks to the enhanced effect of the spatial hole burning, but also effectively introduces the effect of the spectral filtering to lead the Nd:YLF laser to be in a second harmonic mode-locked status. Consequently, pulse durations as short as 8 ps and 8.5 ps are obtained at 1053 nm and 1047 nm with a pulse repetition rate of 5.434 GHz.

© 2012 OSA

1. Introduction

High-power mode-locked solid-state lasers with multi-GHz pulse repetition rate are attractive in a great number of applications including high-speed optical sampling, optical clocking, ultrafast spectroscopy, high-capacity telecommunication, and so on [1

1. U. Keller, “Recent developments in compact ultrafast lasers,” Nature 424(6950), 831–838 (2003). [CrossRef] [PubMed]

]. The Nd:YLF crystal is specifically characterized by the negative dependence of the refractive index on the temperature, which can partly compensate for the positive contribution from the end-face bulging of the gain medium to exhibit a relatively weak thermal-lensing effect. As a consequence, the Nd:YLF crystal is recognized as one of the most competitive candidates for constructing high-power lasers with excellent output beam quality. In addition, the natural birefringence enables the Nd:YLF crystal to easily emit a linearly polarized beam and completely eliminate the possibility of the thermal depolarization under the high-power operation. More importantly, the Nd:YLF crystal has a gain bandwidth wider than 1 nm at the transition line of 4F3/24I11/2, which is more favorable for generating short-duration mode-locked pulses as compared with other Nd-doped laser crystal. Over the past years, continuous-wave (CW) mode-locked operation in the Nd:YLF crystal has been successfully realized with various methods [2

2. K. J. Weingarten, D. C. Shannon, R. W. Wallace, and U. Keller, “Two-gigahertz repetition-rate, diode-pumped, mode-locked Nd:YLF laser,” Opt. Lett. 15(17), 962–964 (1990). [CrossRef] [PubMed]

8

8. S. D. Pan and Y. G. Wang, “Diode end-pumped passively mode-locked Nd:YLF laser at 1047 nm using single-wall carbon nanotubes based saturable absorber,” Laser Phys. 21(8), 1353–1357 (2011). [CrossRef]

]. However, high-power mode-locked Nd:YLF lasers with the pulse repetition rate up to several GHz have been scarcely demonstrated so far.

In this work, we report our experimental observations on a diode-pumped self-mode-locked Nd:YLF laser with multi-GHz pulse repetition rate for the first time. A novel approach that bases on the natural birefringence of a wedged Nd:YLF crystal and the alignment sensitivity of an optical resonator is utilized for efficient selection of the output polarization state. With the developed method, stable self-mode-locked operations with TEM00 transverse mode are accomplished for the σ- and π-polarization, respectively. At an incident pump power of 6.93 W, this compact pulsed laser produces output powers up to 2.15 W and 1.15 W at 1053 nm and 1047 nm under a pulse repetition rate of 2.717 GHz. We find that decreasing the separation between the gain medium and the input mirror brings in the pulse shortening thanks to the enhanced effect of the spatial hole burning (SHB), where the shortest pulse widths of 8 ps and 8.5 ps are obtained for the σ- and π-polarization, respectively. Furthermore, the occurrence of the second harmonic mode locking rather than the fundamental mode locking is experimentally observed when the gain medium is closely adjacent to the input mirror.

2. Experimental setup

The experimental setup for the diode-pumped self-mode-locked Nd:YLF laser is schematically sketched in Fig. 1
Fig. 1 Configuration of the cavity setup for the diode-pumped self-mode-locked Nd:YLF laser.
. The input mirror was a concave mirror with the radius of curvature of 500 mm. It was antireflection (AR) coated at 806 nm on the entrance face, and was coated for high transmission at 806 nm as well as for high reflection at 1053 nm on the second surface. The gain medium was a 0.8 at. % a-cut Nd:YLF crystal with dimensions of 3 × 3 × 20 mm3. Both facets of the laser crystal were AR coated at 806 nm and 1053 nm. Besides, the second surface of the gain medium was wedged at an angle θw = 3 with respect to the first surface for efficient selection of the output polarization state as well as absolute elimination of the etalon effect. The laser crystal was wrapped with indium foil and mounted in a water-cooled copper heat sink with the temperature of 16°C. The pump source was an 806-nm fiber-coupled laser diode with the core diameter of 400 μm and the numerical aperture of 0.14. The pump beam with the spot radius of approximately 200 μm was re-imaged inside the laser crystal with a lens set that has the focal length of 25 mm and the coupling efficiency of 90%. A flat wedged mirror with the reflectivity of 90% in the range of 1040-1060 nm was used as the output coupler during the experiment, which is experimentally found to allow for the maximum output power under the CW mode-locked circumstance and provide sufficient intracavity energy for stable self mode locking simultaneously. The optical cavity length was set to be about 55 mm, which corresponds to the free spectral range of 2.717 GHz. By using the ABCD-matrix theory, the cavity mode radius inside the laser crystal was calculated to be 230 μm. It should be mentioned that the stable self-mode-locked operation could be realized with the optical cavity length ranging from 45 mm to 100 mm, corresponding to the free spectral range of 1.5-3 GHz.

The real-time temporal behaviors of the mode-locked pulses were received by a high-speed InGaAs photodetector with the rise time of 35 ps, and the recorded signal was connected to a digital oscilloscope (Agilent, DSO 80000) with the electrical bandwidth of 12 GHz and the maximum sampling interval of 25 ps. The output signal of the photodetector was also delivered to a radio frequency (RF) spectrum analyzer (Advantest, R3256A) with the bandwidth of 8 GHz. The fine structure of the mode-locked pulses was measured with the help of a commercial autocorrelator (APE pulse check, Angewandte Physik and Elektronik GmbH). A Fourier optical spectrum analyzer (Advantest, Q8347), which is constructed with a Michelson interferometer, was employed to monitor the spectral information with the resolution of 0.003 nm.

3. Performance of the self-mode-locked Nd:YLF laser

On the basis of the combined effect of the different deflection angle for the σ- and π-polarization due to the natural birefringence of a wedged laser crystal and the alignment sensitivity of an optical resonator, we experimentally verify that the output polarization state of the Nd:YLF laser could be switched simply by tilting the orientation of the output coupler [17

17. Y. J. Huang, C. Y. Tang, W. L. Lee, Y. P. Huang, S. C. Huang, and Y. F. Chen, “Efficient passively Q-switched Nd:YLF TEM00-mode laser at 1053 nm: selection of polarization with birefringence,” Appl. Phys. B , doi:. [CrossRef]

]. Note that the σ- and π-polarization in the Nd:YLF crystal correspond to the emission lines at 1053 nm and 1047 nm, respectively. Then the Nd:YLF laser was finely adjusted to be in a steady CW mode-locked state by monitoring the real-time oscilloscope traces. The separation d between the laser crystal and the input mirror was initially set to be around 8 mm. At a pulse repetition rate of 2.717 GHz, the output powers for the CW mode locking at 1053 nm and 1047 nm as a function of the incident pump power at 806 nm are illustrated in Fig. 2
Fig. 2 Output powers for the CW mode locking at 1053 nm and 1047 nm as a function of the incident pump power at 806 nm, where the pulse repetition rate is 2.717 GHz. Inset: two-dimensional spatial distribution of the TEM00 transverse mode for the case of the σ-polarization.
. Note that the stable CW self-mode-locked operation could always be achieved as long as the incident pump power reaches the threshold. Meanwhile, the laser beam radius of 230 μm is larger than the pump beam radius of 200 μm in the present setup, which leads to a relatively large diffraction loss induced by the thermal lens aberration. Based on the assumption of a Gaussian-like pump profile and following the analysis in Ref [18

18. G. Q. Xie, D. Y. Tang, L. M. Zhao, L. J. Qian, and K. Ueda, “High-power self-mode-locked Yb:Y2O3 ceramic laser,” Opt. Lett. 32(18), 2741–2743 (2007). [CrossRef] [PubMed]

], here we find that the combined effect of the mode size change in the laser crystal due to the Kerr self-focusing and the thermally induced diffraction loss could result in the nonlinear diffraction loss modulation on the order of 10−4. This nonlinear loss modulation of the so-called thermo-Kerr mode locking is experimentally confirmed to be sufficient for the self-starting of the present self-mode-locked laser, where the required nonlinear loss modulation is numerically estimated to be around 10−5 [18

18. G. Q. Xie, D. Y. Tang, L. M. Zhao, L. J. Qian, and K. Ueda, “High-power self-mode-locked Yb:Y2O3 ceramic laser,” Opt. Lett. 32(18), 2741–2743 (2007). [CrossRef] [PubMed]

]. Refer to the Fig. 2, the threshold pump powers at 1053 nm and 1047 nm are found to be almost the same. The maximum output power as high as 2.15 W is achieved for the σ-polarization, while the maximum output power for the π-polarization is 1.15 W. The two-dimensional spatial distributions at 1053 nm and 1047 nm under an incident pump power of 6.93 W were recorded with a digital camera, and both are found to display a near-diffraction-limited TEM00 transverse mode, as revealed in the inset of Fig. 2 for the case of the σ-polarization.

Typical oscilloscope traces of the mode-locked pulses at 1053 nm are illustrated in Figs. 3(a)
Fig. 3 Performance of the self-mode-locked Nd:YLF laser at 1053 nm: oscilloscope traces with the time span of (a) 1 μs and (b) 5 ns; RF spectrum with the frequency span of (c) 7 GHz and (d) 10 MHz; (e) autocorrelation trace for d = 8 mm; (f) optical spectrum for d = 8 mm; (g) autocorrelation trace for d = 0.5 mm; (h) optical spectrum for d = 0.5 mm.
-3(b) with the time span of 1 μs and 5 ns, respectively. The amplitude fluctuation is experimentally found to be better than 2%. Moreover, the full modulation of the pulse trains without any CW background indicates that the complete mode locking is achieved in the current configuration. It is also worthwhile to mention that the Q-switched mode locking is not experimentally observed in the self-mode-locked Nd:YLF laser. For Q-switched mode locking, the period between the Q-switched envelops ranges from several hundreds of microsecond to several millisecond. However, the pulse train in millisecond time scale is not presented here because the temporal behavior could not be properly resolved with such wide time span owing to the reduction of the sampling rate. Therefore, we measure the RF spectrum to confirm the stability of the present self-mode-locked Nd:YLF laser, which is displayed in Figs. 3(c)-3(d). It can be seen clearly that the peak of the fundamental harmonic is 35 dBc above the background level, and the relaxation oscillation sidebands are negligibly observable. The stability of the laser is examined by the relative frequency deviation of the fundamental harmonic Δν/ν, where ν is the central frequency and Δν is the full width at half maximum (FWHM) of the fundamental harmonic, respectively. The relative frequency deviation of the fundamental harmonic is experimentally found to be around 10−5 over the day-long operation, which implies a nice long term stability.

On the other hand, Fig. 3(e) reveals the autocorrelation trace at 1053 nm. Assuming the temporal intensity to follow the Gaussian-shaped profile, the pulse width could be evaluated as 28.5 ps. Figure 3(f) depicts the corresponding optical spectrum with the central wavelength of 1053.34 nm and the FWHM of approximately 0.05 nm. As a result, the time-bandwidth product is estimated to be 0.424, which indicates the present pulses to be frequency chirped. Note that the mode spacing of 0.01 nm between the adjacent longitudinal modes is consistent with the fundamental harmonic of 2.717 GHz, as indicated in Fig. 3(f).

Finally, the overall characteristics for the self-mode-locked Nd:YLF laser at 1047 nm are graphically summarized in Fig. 4
Fig. 4 Performance of the self-mode-locked Nd:YLF laser at 1047 nm: oscilloscope traces with the time span of (a) 1 μs and (b) 5 ns; RF spectrum with the frequency span of (c) 7 GHz and (d) 10 MHz; (e) autocorrelation trace for d = 8 mm; (f) optical spectrum for d = 8 mm; (g) autocorrelation trace for d = 0.5 mm; (h) optical spectrum for d = 0.5 mm.
. Generally speaking, the mode-locked performance for the π-polarization is found to be similar to the results obtained with the σ-polarization.

4. Conclusion

In summary, we have developed a novel technique that relies on the natural birefringence of a wedged laser crystal and the alignment sensitivity of an optical resonator to realize the reliable TEM00-mode self-mode-locked lasers in the Nd:YLF crystal at 1053 nm and 1047 nm, respectively. It is experimentally found that the fundamental mode locking of the Nd:YLF laser could be reliably obtained with the tunable pulse repetition rate in the range of 1.5-3 GHz. At an incident pump power of 6.93 W and a pulse repetition rate of 2.717 GHz, this compact mode-locked laser produces the output powers up to 2.15 W and 1.35 W for the σ- and π-polarization, respectively. Furthermore, we have found that decreasing the separation between the laser crystal and the input mirror not only brings in the pulse shortening due to the enhancement of the SHB effect, where the shortest pulse durations at 1053 nm and 1047 nm are 8 ps and 8.5 ps, but also effectively introduces the effect of the spectral filtering to cause the Nd:YLF laser to operate at the second harmonic mode locking instead of the fundamental mode locking.

Acknowledgments

The authors thank the National Science Council for their financial support of this research under Contract No. NSC-100-2628-M-009-001-MY3.

References and links

1.

U. Keller, “Recent developments in compact ultrafast lasers,” Nature 424(6950), 831–838 (2003). [CrossRef] [PubMed]

2.

K. J. Weingarten, D. C. Shannon, R. W. Wallace, and U. Keller, “Two-gigahertz repetition-rate, diode-pumped, mode-locked Nd:YLF laser,” Opt. Lett. 15(17), 962–964 (1990). [CrossRef] [PubMed]

3.

G. P. A. Malcolm, P. F. Curley, and A. I. Ferguson, “Additive-pulse mode locking of a diode-pumped Nd:YLF laser,” Opt. Lett. 15(22), 1303–1305 (1990). [CrossRef] [PubMed]

4.

T. Juhasz, S. T. Lai, and M. A. Pessot, “Efficient short-pulse generation from a diode-pumped Nd:YLF laser with a piezoelectrically induced diffraction modulator,” Opt. Lett. 15(24), 1458–1460 (1990). [CrossRef] [PubMed]

5.

K. J. Weingarten, U. Keller, T. H. Chiu, and J. F. Ferguson, “Passively mode-locked diode-pumped solid-state-lasers that use an antiresonant Fabry - Perot saturable absorber,” Opt. Lett. 18(8), 640–642 (1993). [CrossRef] [PubMed]

6.

M. B. Danailov, G. Cerullo, V. Magni, D. Segala, and S. De Silvestri, “Nonlinear mirror mode locking of a cw Nd:YLF laser,” Opt. Lett. 19(11), 792–794 (1994). [CrossRef] [PubMed]

7.

S. D. Pan, J. L. He, Y. E. Hou, Y. X. Fan, H. T. Wang, Y. G. Wang, and X. Y. Ma, “Diode-end-pumped passively CW mode-locked Nd:YLF laser by the LT-In0.25Ga0.75As absorber,” IEEE J. Quantum Electron. 42(10), 1097–1100 (2006). [CrossRef]

8.

S. D. Pan and Y. G. Wang, “Diode end-pumped passively mode-locked Nd:YLF laser at 1047 nm using single-wall carbon nanotubes based saturable absorber,” Laser Phys. 21(8), 1353–1357 (2011). [CrossRef]

9.

U. Keller, K. J. Weingarten, F. X. Kärtner, D. Kopf, B. Braun, I. D. Jung, R. Fluck, C. Hönninger, N. Matuschek, and J. A. D. Au, “Semiconductor saturable absorber mirrors (SESAM’s) for femtosecond to nanosecond pulse generation in solid-state lasers,” IEEE J. Sel. Top. Quantum Electron. 2(3), 435–453 (1996). [CrossRef]

10.

S. Tsuda, W. H. Knox, S. T. Cundiff, W. Y. Jan, and J. E. Cunningham, “Mode-locking ultrafast solid-state lasers with saturable Bragg reflectors,” IEEE J. Sel. Top. Quantum Electron. 2(3), 454–464 (1996). [CrossRef]

11.

C. Hönninger, R. Paschotta, F. Morier-Genoud, M. Moser, and U. Keller, “Q-switching stability limits of continuous-wave passive mode locking,” J. Opt. Soc. Am. B 16(1), 46–56 (1999). [CrossRef]

12.

H. C. Liang, R. C. C. Chen, Y. J. Huang, K. W. Su, and Y. F. Chen, “Compact efficient multi-GHz Kerr-lens mode-locked diode-pumped Nd:YVO4 laser,” Opt. Express 16(25), 21149–21154 (2008). [CrossRef] [PubMed]

13.

H. C. Liang, Y. J. Huang, W. C. Huang, K. W. Su, and Y. F. Chen, “High-power, diode-end-pumped, multigigahertz self-mode-locked Nd:YVO4 laser at 1342 nm,” Opt. Lett. 35(1), 4–6 (2010). [CrossRef] [PubMed]

14.

H. C. Liang, Y. J. Huang, P. Y. Chiang, and Y. F. Chen, “Highly efficient Nd:Gd0.6Y0.4VO4 laser by direct in-band pumping at 914 nm and observation of self-mode-locked operation,” Appl. Phys. B 103(3), 637–641 (2011). [CrossRef]

15.

A. V. Okishev and W. Seka, “Diode-pumped Nd:YLF master oscillator for the 30-kJ (UV), 60-beam OMEGA laser facility,” IEEE J. Sel. Top. Quantum Electron. 3(1), 59–63 (1997). [CrossRef]

16.

M. S. Ribeiro, D. F. Silva, E. P. Maldonado, W. de Rossi, and D. M. Zezell, “Effects of 1047-nm neodymium laser radiation on skin wound healing,” J. Clin. Laser Med. Surg. 20(1), 37–40 (2002). [CrossRef] [PubMed]

17.

Y. J. Huang, C. Y. Tang, W. L. Lee, Y. P. Huang, S. C. Huang, and Y. F. Chen, “Efficient passively Q-switched Nd:YLF TEM00-mode laser at 1053 nm: selection of polarization with birefringence,” Appl. Phys. B , doi:. [CrossRef]

18.

G. Q. Xie, D. Y. Tang, L. M. Zhao, L. J. Qian, and K. Ueda, “High-power self-mode-locked Yb:Y2O3 ceramic laser,” Opt. Lett. 32(18), 2741–2743 (2007). [CrossRef] [PubMed]

19.

B. Braun, K. J. Weingarten, F. X. Kärtner, and U. Keller, “Continuous-wave mode-locked solid-state lasers with enhanced spatial hole burning: Part I,” Appl. Phys. B 61(5), 429–437 (1995). [CrossRef]

F. X. Kärtner, B. Braun, and U. Keller, “Continuous-wave mode-locked solid-state lasers with enhanced spatial hole burning: Part II,” Appl. Phys. B 61(6), 569–579 (1995). [CrossRef]

20.

Y. J. Huang, Y. P. Huang, H. C. Liang, K. W. Su, Y. F. Chen, and K. F. Huang, “Comparative study between conventional and diffusion-bonded Nd-doped vanadate crystals in the passively mode-locked operation,” Opt. Express 18(9), 9518–9524 (2010). [CrossRef] [PubMed]

21.

Y. F. Chen, Y. J. Huang, P. Y. Chiang, Y. C. Lin, and H. C. Liang, “Controlling number of lasing modes for designing short-cavity self-mode-locked Nd-doped vanadate lasers,” Appl. Phys. B 103(4), 841–846 (2011). [CrossRef]

OCIS Codes
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3530) Lasers and laser optics : Lasers, neodymium
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.4050) Lasers and laser optics : Mode-locked lasers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: June 22, 2012
Revised Manuscript: July 19, 2012
Manuscript Accepted: July 19, 2012
Published: July 24, 2012

Citation
Y. J. Huang, Y. S. Tzeng, C. Y. Tang, Y. P. Huang, and Y. F. Chen, "Tunable GHz pulse repetition rate operation in high-power TEM00-mode Nd:YLF lasers at 1047 nm and 1053 nm with self mode locking," Opt. Express 20, 18230-18237 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-16-18230


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References

  1. U. Keller, “Recent developments in compact ultrafast lasers,” Nature424(6950), 831–838 (2003). [CrossRef] [PubMed]
  2. K. J. Weingarten, D. C. Shannon, R. W. Wallace, and U. Keller, “Two-gigahertz repetition-rate, diode-pumped, mode-locked Nd:YLF laser,” Opt. Lett.15(17), 962–964 (1990). [CrossRef] [PubMed]
  3. G. P. A. Malcolm, P. F. Curley, and A. I. Ferguson, “Additive-pulse mode locking of a diode-pumped Nd:YLF laser,” Opt. Lett.15(22), 1303–1305 (1990). [CrossRef] [PubMed]
  4. T. Juhasz, S. T. Lai, and M. A. Pessot, “Efficient short-pulse generation from a diode-pumped Nd:YLF laser with a piezoelectrically induced diffraction modulator,” Opt. Lett.15(24), 1458–1460 (1990). [CrossRef] [PubMed]
  5. K. J. Weingarten, U. Keller, T. H. Chiu, and J. F. Ferguson, “Passively mode-locked diode-pumped solid-state-lasers that use an antiresonant Fabry - Perot saturable absorber,” Opt. Lett.18(8), 640–642 (1993). [CrossRef] [PubMed]
  6. M. B. Danailov, G. Cerullo, V. Magni, D. Segala, and S. De Silvestri, “Nonlinear mirror mode locking of a cw Nd:YLF laser,” Opt. Lett.19(11), 792–794 (1994). [CrossRef] [PubMed]
  7. S. D. Pan, J. L. He, Y. E. Hou, Y. X. Fan, H. T. Wang, Y. G. Wang, and X. Y. Ma, “Diode-end-pumped passively CW mode-locked Nd:YLF laser by the LT-In0.25Ga0.75As absorber,” IEEE J. Quantum Electron.42(10), 1097–1100 (2006). [CrossRef]
  8. S. D. Pan and Y. G. Wang, “Diode end-pumped passively mode-locked Nd:YLF laser at 1047 nm using single-wall carbon nanotubes based saturable absorber,” Laser Phys.21(8), 1353–1357 (2011). [CrossRef]
  9. U. Keller, K. J. Weingarten, F. X. Kärtner, D. Kopf, B. Braun, I. D. Jung, R. Fluck, C. Hönninger, N. Matuschek, and J. A. D. Au, “Semiconductor saturable absorber mirrors (SESAM’s) for femtosecond to nanosecond pulse generation in solid-state lasers,” IEEE J. Sel. Top. Quantum Electron.2(3), 435–453 (1996). [CrossRef]
  10. S. Tsuda, W. H. Knox, S. T. Cundiff, W. Y. Jan, and J. E. Cunningham, “Mode-locking ultrafast solid-state lasers with saturable Bragg reflectors,” IEEE J. Sel. Top. Quantum Electron.2(3), 454–464 (1996). [CrossRef]
  11. C. Hönninger, R. Paschotta, F. Morier-Genoud, M. Moser, and U. Keller, “Q-switching stability limits of continuous-wave passive mode locking,” J. Opt. Soc. Am. B16(1), 46–56 (1999). [CrossRef]
  12. H. C. Liang, R. C. C. Chen, Y. J. Huang, K. W. Su, and Y. F. Chen, “Compact efficient multi-GHz Kerr-lens mode-locked diode-pumped Nd:YVO4 laser,” Opt. Express16(25), 21149–21154 (2008). [CrossRef] [PubMed]
  13. H. C. Liang, Y. J. Huang, W. C. Huang, K. W. Su, and Y. F. Chen, “High-power, diode-end-pumped, multigigahertz self-mode-locked Nd:YVO4 laser at 1342 nm,” Opt. Lett.35(1), 4–6 (2010). [CrossRef] [PubMed]
  14. H. C. Liang, Y. J. Huang, P. Y. Chiang, and Y. F. Chen, “Highly efficient Nd:Gd0.6Y0.4VO4 laser by direct in-band pumping at 914 nm and observation of self-mode-locked operation,” Appl. Phys. B103(3), 637–641 (2011). [CrossRef]
  15. A. V. Okishev and W. Seka, “Diode-pumped Nd:YLF master oscillator for the 30-kJ (UV), 60-beam OMEGA laser facility,” IEEE J. Sel. Top. Quantum Electron.3(1), 59–63 (1997). [CrossRef]
  16. M. S. Ribeiro, D. F. Silva, E. P. Maldonado, W. de Rossi, and D. M. Zezell, “Effects of 1047-nm neodymium laser radiation on skin wound healing,” J. Clin. Laser Med. Surg.20(1), 37–40 (2002). [CrossRef] [PubMed]
  17. Y. J. Huang, C. Y. Tang, W. L. Lee, Y. P. Huang, S. C. Huang, and Y. F. Chen, “Efficient passively Q-switched Nd:YLF TEM00-mode laser at 1053 nm: selection of polarization with birefringence,” Appl. Phys. B, doi:. [CrossRef]
  18. G. Q. Xie, D. Y. Tang, L. M. Zhao, L. J. Qian, and K. Ueda, “High-power self-mode-locked Yb:Y2O3 ceramic laser,” Opt. Lett.32(18), 2741–2743 (2007). [CrossRef] [PubMed]
  19. B. Braun, K. J. Weingarten, F. X. Kärtner, and U. Keller, “Continuous-wave mode-locked solid-state lasers with enhanced spatial hole burning: Part I,” Appl. Phys. B61(5), 429–437 (1995).F. X. Kärtner, B. Braun, and U. Keller, “Continuous-wave mode-locked solid-state lasers with enhanced spatial hole burning: Part II,” Appl. Phys. B61(6), 569–579 (1995). [CrossRef]
  20. Y. J. Huang, Y. P. Huang, H. C. Liang, K. W. Su, Y. F. Chen, and K. F. Huang, “Comparative study between conventional and diffusion-bonded Nd-doped vanadate crystals in the passively mode-locked operation,” Opt. Express18(9), 9518–9524 (2010). [CrossRef] [PubMed]
  21. Y. F. Chen, Y. J. Huang, P. Y. Chiang, Y. C. Lin, and H. C. Liang, “Controlling number of lasing modes for designing short-cavity self-mode-locked Nd-doped vanadate lasers,” Appl. Phys. B103(4), 841–846 (2011). [CrossRef]

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