抽运光强度对光学抽运重水气体产生THz激光的影响分析

利用半经典理论，对脉冲光学抽运重水气体产生THz激光信号过程进行分析，对其中抽运光强度与输出THz信号光之间的关系进行了数值计算和求解，结果表明，THz信号出射光强度跟抽运源入射光强度之间不满足简单的线性关系，而是呈现高阶的非线性关系.在工作介质腔长、气压和工作温度一定的条件下，存在最佳抽运光强度，在一定的抽运光强范围内，THz信号出射光强度与抽运源入射光强度的关系呈现近似线性的增长关系，抽运光能量和信号光能量之间的转换效率相对较高，当抽运光强超过一定值时，由于瓶颈效应的发生会导致THz输出信号的逐步减弱，并产生一定的频率调谐范围.

Effect of pump laser intensity on optically pumped D2O gas terahertz laser

Based on the semi-classical theory,the pulsed-laser pumped D2O gas tera-Hz laser was theoretically analyzed,the relation between the intensity of pumping laser and the output tera-Hz laser light was studied and numerically calculated.According to the result of calculation,the intensity of the output tera-Hz laser light increased approximately linearly with that of the input laser in a certain range,but gradually decreased because of the bottleneck effect when the intensity of the input laser exceeded a fixed value,and for given gas pressure,cavity length and operating temperature,an optimal intensity of pumping laser exists.A frequency tuning range of the output signal occurred when the intensity of the input laser was strong enough.