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利用TEA-CO2激光对碲铬汞(HgCdTe)图像传感器的干扰和损伤现象进行了实验研究,分析了干扰和损伤机理。探测器上激光能量密度小于255mJ/cm2时,饱和像素仅出现在光斑区域,激光能量密度为425.8mJ/cm2时,像素被损伤,观察到了弥散斑和暗环等现象。建立了探测器的激光辐照模型,计算了探测器的温升,讨论了温升与载流子浓度、迁移率的关系。分析认为,弥散斑的出现是探测器升温产生的热激发载流子浓度扩散所致,暗环的出现是迁移率与载流子浓度扩散共同作用的结果,像素的损伤则是因为温升导致汞的析出。
The interference and damage of HgCdTe (HgCdTe) image sensor with TEA-CO2 laser were studied experimentally, and the interference and damage mechanism were analyzed. When the laser energy density is less than 255mJ / cm2 on the detector, the saturated pixel only appears in the spot area. When the laser energy density is 425.8mJ / cm2, the pixel is damaged and the phenomenon of diffuse spots and dark circles are observed. The laser radiation model of the detector was established, the temperature rise of the detector was calculated, and the relationship between temperature rise and carrier concentration and mobility was discussed. It is considered that the appearance of diffuse speckle is caused by the diffusion of thermally-excited carrier concentration caused by the temperature rise of the detector. The appearance of the dark ring is the result of the interaction between the mobility and the diffusion of carrier concentration. The damage of the pixel is caused by the temperature rise Mercury precipitation.