Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Output Characteristics of a Q-Switched Nd:YAG laser with GRM(Gaussian Reflectivity Mirror) unstable resonator

GRM(Gaussian Reflectivity Mirror)을 이용한 불안정 공진기형 Q-스위치 Nd:YAG 레이저의 출력특성

  • Lee, Hee-Chul (Ilsan Technotown) ;
  • Kim, Yong-Pyung (College of Electronics and Information / Institute for Laser Engineering Kyunghee University)
  • Published : 2005.02.01
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Abstract

We investigated the operational characteristics of a Q-switched Nd:YAG laser, which has an unstable resonator with a GRM(Gaussian reflectivity mirror). With electrical input energy of 55 J, we obtained the fundamental energy of 470 mJ at 1064 nm and the frequency doubled energy of 280 mJ at 532 nm. The Top-Hat profile of the output beam was obtained at the near field, and beam divergence was 1.7 mard.

출력거울로 GRM(Gaussian reflectivity mirror)을 채택한 불안정 공진기를 구성하여 그 Q-스위치 출력의 특성을 분석하였다. 입력 전기에너지가 55J 일 때 1064 nm의 기본파장에서 470 mJ, 532 nm의 제2고조파 파장에서 280 mJ의 출력 에너지를 얻었다. 출력빔의 발산각은 1.7 mrad 이었으며 근접장 영역에서 Top-Hat 형태의 빔을 얻을 수 있었다.

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References

  1. A. E. Siegman,'Unstable Optical Resonators for Laser Applications,' Proceeding of the IEEE, vol. 53, pp. 277-287, 1965 https://doi.org/10.1109/PROC.1965.3685
  2. Y. U. Anan'ev, Laser resonators and the beam divergence problem(Adam Hilger, Bristol, Philadelphia and New York, 1992) pp. 135-137
  3. 박명권, '펄스 반복율 10-Hz의 Positive-branch Confocal Unstable Resonator Nd: YAG 레이저', 새물리, vol. 22, no. 3, pp. 223-229, 1982
  4. M. Morin, 'Graded reflectivity mirror unstable laser resonator design,' Proc. SPIE, vol. 3267, pp. 52-65, Laser Resonators, 1998 https://doi.org/10.1117/12.308125
  5. S. De Silvestri, 'Rod-imaging unstable resonators with super-Gaussian mirrors,' Pure Appl. Opt., vol. 3, pp. 507-514, 1994 https://doi.org/10.1088/0963-9659/3/4/012
  6. K. J. Snell, 'Diffraction-limited Nd:Glass and Alexandrite Lasers using Graded Reflectivity Mirror Unstable Resonator' , Proc. SPIE, vol. 1410, pp. 99-106, 1991
  7. M. S. Bowers, 'Diffractive analysis of unstable optical resonators with super-Gaussian mirrors,' Opt. Lett., vol. 17, pp. 1319-1321, 1992 https://doi.org/10.1364/OL.17.001319
  8. K. Yasui, 'Off-axis one-sided negative branch unstable resonators compared with positive-branch unstable resonators in wave-optics characteristics,' Proc. SPIE, vol. 4270, pp. 64-70, 2001 https://doi.org/10.1117/12.424679
  9. N. Hodgson, 'High-power solid-state lasers with unstable resonators,' Opt. Quantum Electron., vol. 22, pp. 39-55, 1990 https://doi.org/10.1007/BF02088999
  10. 김연수, '압력광파면 왜곡에 따른 광학계 성능', 한국광학회지, vol. 12, no. 3, pp. 172-176, 2001
  11. R. weber, 'Thermal effects in solid-state laser materials,' Optical Materials, vol. 11, pp. 245-254, 1999 https://doi.org/10.1016/S0925-3467(98)00047-0
  12. W.Koechner, Solid-State Laser Engineering(Springer, 1999) pp. 408
  13. W.Koechner, Solid-State Laser Engineering(Springer, 1999) pp. 220
  14. Kwang Suk Kim, 'Measurement of the temperature and the pumping uniformity inside a Nd-YAG rod by an interferometric method', Appl. Phys. Lett., vol. 58, no. 17, pp. 1810-1812, 1991 https://doi.org/10.1063/1.105096
  15. N.Hodgson, Optical Resonators(Springer, 1997) pp. 604
  16. Peng. HaiBo, 'Optimum of Q-switched Nd:YAG lasers with super Gaussian mirrors', SPIE, vol. 2889, pp 436-440, 1996
  17. Zhou Shouhuan, 'Nd:YAG Q-Switched Laser with Variable Reflectivity Mirror(VRM) Resonator', SPIE, vol. 1979, pp. 269-274, 1992
  18. D.C.Hanna, 'Large volume $TEM_{00}$ mode of Nd:YAG lasers', Optics Communications, vol. 37, no. 5, pp. 359-362, 1981 https://doi.org/10.1016/0030-4018(81)90436-3