光泵NH_3远红外激光器样品管长度优化研究

Study of the Optimum Length of the Sample Tube for Optically Pumped NH_3 FIR Lasers

对光泵NH_3远红外激光器的最佳样品管长度进行了理论和实验的研究。通过实验观察到,光泵远红外激光器的样品管必有一个最佳长度。与实验相比发现。三能级模型理论作为OPFIRL工程设计是不够准确的。有些因子,如折光系数η,不能粗糙地假定它是个常数。

The optically pumped NH_3 FIR laser(OPFIRL)was studied theoretically and experimentally for the optimum length of the sample tube of the laser system.It was found experimentally that,for optimum operation of an PFIRL,there exists an optimum length of sample tube under certain pumping density and operating gas pressure.Comparing with the experimental results,we found that the theory with 3-level model is not accurate enough for engineering design of OPFIRL.Some parameters such as refractive index,cannot be considered to be a constant.