在AgGase_2晶体中TEA　CO_2激光的倍频产生

Second Harmonic Generation of TEA CO_2 Laser in the AgGaSe_2 Crystal

用炉温下降法生长出尺寸为φ２０×６０ｍｍ的ＡｇＧａＳｅ２单晶体。在１２ｍｍ长，切角为５５°的ＡｇＧａＳｅ２中，获得了ＴＥＡＣＯ２激光的倍频输出，其功率转换效率为１．１２％。泵浦阈值和破坏阈值分别为３ＭＷ／ｃｍ２和１１ＭＷ／ｃｍ２。还讨论了泵浦束的发散角对二次谐波转换效率的影响。

AgGaSe2 crystal of φ 20 × 60 mm has been grown by the method of oven temperature drop. The frequency-doubled (5. 3 μm) output and the power conversion efficiency of 1. 12% have been obtained for second harmonic generation of TEA CO2 laser (10. 6 μm). The pumped and the damaged threshold are about 3 MW/cm2 and 11 MW/cm2, respectively. We have also discussed the effect of the beam divergence on the second harmonic conversion efficiency.