摘要
研究了Hg Cd Te红外探测器的结构以及材料特性,阐述了激光损伤Hg Cd Te红外探测器的机理,建立了Hg Cd Te红外探测器三维仿真模型,利用有限元分析法,对10.6μm CO2激光辐照Hg Cd Te探测器的温度变化情况进行了仿真,并通过参考已有文献的实验数据,验证了模型的准确性。当Hg Cd Te探测器受到峰值功率密度为5×107 W/cm2的单脉冲激光辐照时,Hg Cd Te晶体的Hg离子开始析出,探测器性能降低,并不可恢复;当激光峰值功率为108 W/cm2,探测器Hg Cd Te晶体开始出现熔融现象,此时激光能量密度为1 J/cm2;当激光峰值功率为2×108 W/cm2时,铟柱达到熔融温度,探测器会出现铟柱脱落现象,被彻底损坏。
The structure and material properties of the HgCdTe infrared detector was studied, the mechanism of laser damaging HgCdTe infrared detector was described, and the 3D simulation model of HgCdTe infrared detector was built. The temperature changing of HgCdTe detector under 10.6um laser irradiation was simulated depending finite element analysis method. Accuracy of the model was verified by contrasting experimental data of the reference literatures. The simulation results show when the peak power density of the single pulse laser is 5 × 107 W/cm2, Hg ion will separate from HgCdTe crystal and the properties of HgCdTe infrared detector is damaged and could not be restored. When the peak power density of the single pulse laser is 108 W/cm2, HgCdTe crystal of the detector starts to melt, and the laser fluence is 1 J/cm2. When the peak power density of the single pulse laser is 2 × 108 W/cm2, indium column reaches the fusion point and will shed, then the HgCdTe infrared detector is completely damaged.
出处
《红外技术》
CSCD
北大核心
2016年第1期6-9,20,共5页
Infrared Technology
基金
北京市教委科研计划项目(KM201511232005)
