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为研究波段内和波段外组合激光对光导型光电探测器的辐照效应,实验采用532nm(波段内)和1319nm(波段外)双光束组合连续激光辐照光导型CdS光电探测器,分别改变两束激光的辐照功率,得到探测器的电压响应曲线。实验结果表明,光电探测器对波段内和波段外激光都有响应,但在激光开始和停止辐照瞬间探测器对两束激光的响应电压刚好相反。探测器对波段外激光的电压响应随线性工作区间内的波段内激光功率升高而增大;随着波段内激光趋于饱和,对波段外激光的响应电压近似指数级下降。分析认为,光电探测器对波段外激光的响应为光激发热载流子效应,是由自由载流子吸收激光能量产生带内跃迁引起的;波段内激光辐照影响探测器对波段外激光的吸收系数。
In order to study the radiation effect of photoconductive photoconductive photodetectors (PDWs) in and out of the band, a photoconductive CdS photodetector was irradiated by a combination of 532nm (1319nm) and 1319nm Beam laser irradiation power, get the detector voltage response curve. The experimental results show that the photodetector responds to both the intra-band and extra-band laser beams, but the detector responds exactly to the two laser beams at the instant the laser starts and stops irradiating. The voltage response of the detector to the outside of the band increases with the increase of the laser power in the band within the linear working range. As the laser becomes saturated in the band, the response voltage to the out-band laser decreases approximately exponentially. The analysis shows that the photodetector responds to the laser outside the band as the photo-excited hot carrier effect, which is caused by the band gap transition of the free-carrier absorbed laser energy. The laser irradiation in the band affects the effect of the detector on the external laser band Absorption coefficient.