强激光辐照PC型探测器的动态响应

Dynamic Responses of Photoconductive Detectors under High Power Laser Irradiation

基于载流子输运和强激光辐照会产生热效应造成探测器的温升,建立了描述光导(PC)型半导体探测器对激光辐照动态响应的动力学模型及非线性耦合方程组。通过进行数值模拟计算,得到了激光辐照PC型半导体探测器的动态响应情况,数值模拟结果与实验结果相吻合。该模型能适用于任何强度的激光辐照,弱激光辐照时结果与传统模型一致,强激光辐照时能描述探测器的信号饱和效应。

A dynamic model and the relevant nonlinear coupling equations describing dynamic responses of photoconductive (PC) semiconductor detectors were established based on photocarrier transport and the temperature rising in detectors under high power laser irradiation. The dynamic responses of PC semiconductor detectors to laser irradiation were obtained through numerical calculation of the equations. The results of numerical simulation are identical with experimental results. The model can be applied to any power light irradiation. Identical results between this model and traditional model are achieved when low power laser irradiate. The model can describe saturation effect of PC semiconductor detectors under high power laser irradiation.