High Power 4.65 m Single-wavelength Laser by Second-
harmonic Generation of Pulsed TEA CO₂ Laser in AgGaSe₂ and
ZnGeP₂¹

D. J. Li*, J. Guo, G. L. Yang, F. J. Meng, L. M. Zhang, J. J. Xie, F. Chen,
C. L. Shao, C. S. Zhang, Y. M. Geng, and S.M. Li

State Key Laboratory of Laser Interaction with Matter, Changchun Institute of Optics, Fine Mechanics and Physics,
Chinese Academy of Sciences, Changchun, 130033 China

*e-mail: lidj0906@163.com

Received October 19, 2011; in final form, November 3, 2011; published online March 6, 2012

Abstract—A high power 4.65 m single-wavelength laser by second-harmonic generation (SHG) of TEA CO₂
laser pulses in silver gallium selenide (AgGaSe₂) and zinc germanium phosphide (ZnGeP₂) crystals is reported.
Experimental results show that the average output power of SHG laser is not only restricted by the damage
threshold of the nonlinear crystals, but also limited by the irradiated power of fundamental-wave laser depend-
ing on the operating repetition-rate. It is found that ZnGeP₂ can withstand higher 9.3 m laser irradiation inten-
sity than AgGaSe₂. As a result, using a parallel array stacked by seven ZnGeP₂ crystals, an average power of
20.3 W 4.65 m laser is obtained at 250 Hz. To the best of our knowledge, it is the highest output power for
SHG of CO₂ laser by far.

10.1134/S1054660X12040068

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