为了在AgGaSe2 晶体中产生3次谐波，利用自行研制的1台可调谐脉冲CO2激光器，在2次谐波中采用Ⅰ类匹配，并在3次谐波中采用Ⅱ类匹配的方法。实验中CO2激光输出波长为9.6μm，在AgGaSe2 晶体中得到了波长为4.8μm的2次谐波以及波长为3.2μm的3次谐波，其峰值功率分别为88kW和4kW，并测量了相位匹配允许角。结果表明，在该AgGaSe2晶体实验中能有效地输出3次谐波，随着CO2激光功率的增大，输出2次谐波峰值功率和3次谐波峰值功率的级数都增加。

In order to generate the third harmonic in AgGaSe2 crystals, Ⅰand Ⅱ phase-match were applied for the second and third harmonics of CO2 laser respectively. In the experiment, output wavelength of CO2 laser was 9.6μm. The peak power of the second-harmonic at 4.8μm was 88kW and the peak power of the third-harmonic at 3.2μm was 4kW respectively. The phase-matching acceptance angle was measured. The results show that the second-harmonic wave and the third-harmonic wave are acquired effectively and peak power of the second-harmonic wave and third-harmonic wave increase rapidly with the increase of input power of CO2 laser.