Effect of pump laser intensity on optically pumped D2O gas terahertz laser+
抽运光强度对光学抽运重水气体产生THz激光的影响分析

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.