Mid-infrared optical parametric oscillator based on ZnGeP2 pumped by 2-mu m laser

作者：Peng, Yuefeng; Wei, Xingbin^*; Wang, Weimin

来源：Chinese Optics Letters, 2011, 9(6): 061403.

DOI：10.3788/COL201109.061403

We present a 3-5 mu m optical parametric oscillator (OPO) based on ZGP pumped by KTP OPO 2.1-mu m laser. The tuning curves of ZGP OPO are calculated. The 8 x 6 x 18 (mm) ZGP crystal, whose end faces are antireflection coated at 2.1 and 3.7-4.6 mu m, is cut as theta=53.5 degrees, phi=0 degrees. When the pump power of 2.1-mu m polarized laser is 15 W at 8 kHz, 5.7-W output power and 46.6% slope efficiency are obtained with a ZGP type I phase match. Central wavelengths of the signal and idler lasers are 4.10 and 4.32 mu m, respectively. Pulse duration is about 27 ns. Beam quality factor M-2 is better than 1.8. The tunability of 3-5 mu m can be achieved by changing the angle of the ZGP crystal.

• 出版日期2011-6-10
• 单位中国工程物理研究院