光泵远红外激光工作气体压强的最佳值

Study of the Optimum Operating Gas Pressure of the Optically Pumped FIR Laser

本文研究光泵远红外激光器的最佳工作气体压强。采用3能级系统模型,求解量子系统的密度矩阵方程,再用迭代运算法计算远红外激光的输出功率密度。激光器的远红外输出功率密度是泵浦激光功率密度I_p,泵浦频偏x,远红外信号的频偏y,工作气体压强P的函数。改变工作气体压强的值,可求得I_s-P的关系曲线。理论求得的P的最佳值与实验结果很好相符。

The optimum operating gas pressure of the OPFIRL was studied theoretically and experimentally. The density matrix equation of 3-level quantum system was solved and the output FIR power density of OPFIRL was calculated by using the iteration method. The output FIR power density was a function of pumping power density Ip, pumping frequency detuning x, FIR signal frequency detuning y, operating gas pressure. The calculated optimum operating gas pres- sure of the OPFIRL was in good agreement with the experimental results. The correlations between the optimum operating gas pressure and other parameters such as pumping power density, the length of sample tube were clarified.