光泵腔式NH_3分子远红外激光的最佳工作气压研究

STUDY ON OPTIMUM OPERATING GAS PRESSURE OF OPTICALLY PUMPED CAVITY NH3FIR LASER

通过求解量子系统的密度矩阵方程，采用迭代法计算了光泵腔式ＮＨ３分子远红外激光的输出功率密度。在此基础上，对光泵腔式远红外激光的工作气压进行了理论研究。结果表明最佳工作气压与腔的功率反射系数、样品管的长度以及泵功率密度等工作参数之间是相互制约的，同时与参与激光过程的能级有关。在实验上采用电感性金属栅网作为反射器，设计制作出长度分别为１００ｃｍ、２０ｃｍ和１０ｃｍ的Ｆａｂｒｙ－Ｐｅｒｏｔ腔式远红外激光器，然后和ＴＥＡ－ＣＯ２激光器作泵浦源，成功地获得光泵ＮＨ３分子远红外激光，测量结果表明理论计算与实验数据相符。

y solving the density matrix equations of quantum system, the output power density of optically pumped cavity NH3FIR laser was calculated by means of iteration method. Based on the calculations above, the optimum operating gas pressune of cavity NH3-OPFIRLS wore studied, theoretically. Experimental by using inductive metallic meshes as reflectors and coupler. The F-P Cavity FIR lasers with a sample tube of 10, 20 and 100cm in length respectively were designecl and constructed. Meanwhile, FIR laser emicssions of cavity NH3lasers pumped by TEA-CO2.10R(8) and 9R(16) were measured. The experimental results were in good agreemert with our calculation.