光泵远红外激光AC　Stark分裂的频谱特性

SPECTRAL CHARACTERISTIC OF AC STARK SPLITTING IN OPTICALLY PUMPED FIR LASER

利用三能级近似和多组三能级近似模型的光泵远红外激光增益解析表达式，通过迭代运算得到了ＣＯ２－１０Ｒ（８）泵浦ＮＨ３分子远红外激光的工作气压与输出光强的关系曲线和ＡＣＳｔａｒｋ分裂的频谱曲线，以及最佳工作气压的理论值．并在实验中测出了ＮＨ３分子２８１μｍ远红外信号的频谱特性和最佳工作气压．

The output intensity of the optically pumped NH 3 molecules far infrared laser(NH 3 OPFIRL) pumped by CO 2 10R(8) was calculated by solving the density matrix equation and by means of iteration, in which the multi group three level systems were used. The theoretical correlation between the output intensity and operating gas pressure was studied and the theoretical values of the optimum operating gas pressures were calculated. Meanwhile, the spectral characteristic of AC Stark splitting was studied. Lastly, the optimum operating gas pressure and the spectral characteristic of 281μm NH 3 laser line were studied experimentally. The experimental results were in good agreement with the theoretical calculation results.