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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.
The semi-classical theory was used to analyze the process of pulsed optical pumping of heavy water gas to produce THz laser signal. The relationship between the pump light intensity and the output THz signal was numerically calculated and solved. The results show that the THz signal output light intensity With the pumping source incident light intensity does not satisfy the simple linear relationship, but showing a high-order nonlinear relationship.Working medium cavity length, pressure and operating temperature under certain conditions, there is the optimal pumping light intensity, at Within a certain range of pumping light intensity, the relationship between the intensity of emitted THz signal and the intensity of incident light source shows an approximately linear growth relationship, and the conversion efficiency between pumping light energy and signal light energy is relatively high. Light intensity exceeds a certain value, due to the bottleneck effect will lead to the THz output signal gradually weakened, and produce a certain frequency tuning range.