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10.6 μm 激光辐照碲镉汞红外探测器热损伤研究

Research on the Thermal Damage of HgCdTe Infrared Detector under Laser Irradiation of 10.6 μm Wavelength

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摘要

研究了HgCdTe 红外探测器的结构以及材料特性,阐述了激光损伤HgCdTe 红外探测器的机理,建立了HgCdTe 红外探测器三维仿真模型,利用有限元分析法,对10.6 μm CO2 激光辐照HgCdTe 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HgCdTe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,HgCdTe 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HgCdTe 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。

Abstract

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 10.6 μm 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.

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中图分类号:TN216

所属栏目:材料与器件

基金项目:北京市教委科研计划项(KM201511232005)

收稿日期:2015-07-20

修改稿日期:2015-09-24

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栗兴良:北京信息科技大学仪器科学与光电工程学院,北京 100192
牛春晖:北京信息科技大学仪器科学与光电工程学院,北京 100192
马牧燕:北京信息科技大学仪器科学与光电工程学院,北京 100192
吕 勇:北京信息科技大学仪器科学与光电工程学院,北京 100192
耿 蕊:北京信息科技大学仪器科学与光电工程学院,北京 100192

备注:栗兴良(1986-),男,山东临沂人,硕士,主要从事激光应用与光电检测方向研究。

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