基于相对运动的脉冲激光辐照探测器热效应数值分析
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摘要
基于热传导理论,构建了相对运动情况下脉冲激光辐照HgCdTe探测器的理论模型,利用有限元法分析比较了不同重频、不同移动速度下探测器的热效应.结果表明,在相对静止情况下,重频脉冲激光辐照HgCdTe探测器时,激光能量主要被HgCdTe光敏层吸收,温度场高温区主要分布在HgCdTe层与CdZnTe层交界面附近;重频为1kHz、10kHz时几乎没有温度累积效应,当重频为100kHz时,随着脉冲数的增多,峰值温度不断增加,有明显的温度累积效应.在相对运动情况下,随着激光光斑的移动,温度峰值所在的位置逐渐向速度矢量方向偏移.从损伤的角度考虑,当每个温度峰值都大于HgCdTe熔融温度时便能达到损伤的空间区域累积效应,实现对多个探测像元的损伤.定性分析了汇聚到探测器焦平面单脉冲激光光斑在不同移动速度下的热效应,结果表明移动速度越快,脉冲结束时刻峰值温度越低,温升曲线的斜率越小,上升越慢.
Based on the theory of heat conduction,a theoretical model of HgCdTe detector irradiated by pulsed laser in relative motion is established.The thermal effects of the detector at different repetition frequencies and moving speeds are analyzed and compared by finite element method.The results show that the energy of the laser is mainly absorbed by the HgCdTe photosensitive layer and the high temperature field is mainly distributed near the interface between the HgCdTe layer and the CdZnTe layer when the HgCdTe detector is irradiated by a repetitive frequency pulse laser under the relative static condition.There is almost no temperature accumulation effect when the frequency is 1kHz and 10 kHz.While when the frequency is 100 kHz,the peak temperature increases with the increase of the number of pulses,and there is an obvious temperature accumulation effect.The position of the peak temperature shift gradually to the direction of the velocity vector with the movement of the laser spot under the relative motion.From the point of view of damage,the cumulative effect of the damage in the space area can be achieved when each temperature peak is larger than the melting temperature of HgCdTe,and as a result,the damage to multiple detection pixels can be achieved.The thermal effect of the detector irradiated by monopulse laser spot at different moving speeds is analyzed.The faster the laser spot moves,the lower the peak temperature is at the end of the pulse,the smaller of the slope of the temperature rise curve and the slower of the temperature rise.
Based on the theory of heat conduction,a theoretical model of HgCdTe detector irradiated by pulsed laser in relative motion is established.The thermal effects of the detector at different repetition frequencies and moving speeds are analyzed and compared by finite element method.The results show that the energy of the laser is mainly absorbed by the HgCdTe photosensitive layer and the high temperature field is mainly distributed near the interface between the HgCdTe layer and the CdZnTe layer when the HgCdTe detector is irradiated by a repetitive frequency pulse laser under the relative static condition.There is almost no temperature accumulation effect when the frequency is 1kHz and 10 kHz.While when the frequency is 100 kHz,the peak temperature increases with the increase of the number of pulses,and there is an obvious temperature accumulation effect.The position of the peak temperature shift gradually to the direction of the velocity vector with the movement of the laser spot under the relative motion.From the point of view of damage,the cumulative effect of the damage in the space area can be achieved when each temperature peak is larger than the melting temperature of HgCdTe,and as a result,the damage to multiple detection pixels can be achieved.The thermal effect of the detector irradiated by monopulse laser spot at different moving speeds is analyzed.The faster the laser spot moves,the lower the peak temperature is at the end of the pulse,the smaller of the slope of the temperature rise curve and the slower of the temperature rise.
引文
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[2] CHEN Gui-bo,GU Xiu-ying,BI Juan.Numerical analysis of thermal effect in aluminum alloy by repetition frequency pulsed laser[J].Optik,2016,27(20):10115-10121.
[3] TANG Wei,JI Tong-bo,GUO Jin,et al.Numerical analysis of HgCdTe crystal damaged by high repetition frequence CO2laser[J].Chinese Optics,2013,6(5):0736-0742.汤伟,吉桐伯,郭劲,等.高重频CO2激光损伤HgCdTe晶体的数值分析[J].中国光学,2013,6(5):0736-0742.
[4] WEI Zhi,JIN Guang-yong,PENG Bo,et al.Numerical simulation of thermal and stress field in silicon-based positiveintrinsic-negative photodiode irradiated by millisecond-pulsed laser[J].Acta Physica Sinica,2014,63(19):120-125.魏智,金光勇,彭博,等.毫秒脉冲激光辐照硅基PIN的温度场应力场数值分析[J].物理学报,2014,63(19):120-125.
[5] LEI Peng,LI Hua,BIAN Jin-tian,et al.Experimental study of HgCdTe imaging sensor irradiated by TEA-CO2laser[J].Acta Optica Sinica,2013,33(2):0214002.雷鹏,李化,卞进田,等.TEA-CO2激光辐照HgCdTe图像传感器实验研究[J].光学学报,2013,33(2):0214002.
[6] ZHAO Hong-yu,WEI Zhi,JIN Guang-yong.The damage numerical research of pulse sequence laser irradiation photodiode[J].Laser&Optoelectronics Progress,2017,54(4):040401.赵宏宇,魏智,金光勇.脉冲串激光辐照光电二极管损伤的数值研究[J].激光与光电子学进展,2017,54(4):040401.
[7] ZHENG Ye-liang,HU Yi-hua,ZHAO Nan-xiang,et al.Analysis of the influence of pulse width and repetition frequency on damage threshold of HgCdTe detector[J].Infrared Technology,2017,6(2):11-18.郑业亮,胡以华,赵楠翔,等.脉宽及重频对HgCdTe探测器损伤阈值影响分析[J].红外技术,2017,6(2):11-18.
[8] SU Xing-liang,NIU Chun-hui,MA Mu-yan.Research on the thermal damage of HgCdTe infrared detector under laser irradiation of 10.6μm wavelength[J].Infrared Technology,2016,38(1):6-9.栗兴良,牛春辉,马牧燕.10.6μm激光辐照碲镉汞红外探测器热损伤研究[J].红外技术,2016,38(1):6-9.
[9] WANG Si-wen,LI Yan,GUO Li-hong.Analysis on the disturbance of CO2laser to long-wave infrared HgCdTe detector[J].Journal of Infrared&Millimeter Waves,2010,29(2):102-104.王思雯,李岩,郭立红.CO2激光对长波红外HgCdTe探测器干扰的分析[J].红外与毫米波学报,2010,29(2):102-104.
[10] HAN Min,NIE Jin-song,SUN Ke,et al.Experiment on the temporal evolution characteristics of a CCD multilayer structure irradiated by a 1.06μm continuous laser[J].Applied Optics,2018,57(16):4415.
[11] HUANG Feng,NIU Yan-xiong,WANG Yue-feng,et al.Caculation of thermal and mechanical effect induced by laser in optical window materials[J].Acta Optica Sinica,2006,26(4):576-580.黄峰,牛燕雄,汪岳峰,等.窗口材料激光辐照热力效应的解析计算研究[J].光学学报,2006,26(4):576-580.
[12] ZHANG Zhen,CHENG Xiang-ai,WANG Rui,et al.Dazzling effect of repetitive short pulse laser on TDI CCD camera[J].Optics&Lasers in Engineering,2011,49(2):292-296.
[13] ZHU Zhi-wu.Short pulsed laser induced damage to visible light CCD and optical Filter Module[D].Changsha:National University of Defense Technology,2013.朱志武.短脉冲激光对可见光CCD及滤光片组件的损伤效应研究[D].长沙,国防科技大学,2013.
[14] WANG Yi-bin,JIN Guang-yong,ZHANG Wei.Temperature and thermal stress analysis of aluminum alloy plate irradiation by long pulsed laser[J].Chinese Journal of Lasers,2016,43(8):0802006.王翼彬,金光勇,张巍.长脉冲激光作用下铝合金板材温度和热应力分析[J].中国激光,2016,43(8):0802006.
[15] SHEN Xian-feng,YAO Jin,WANG Yang.Numerical simulation of thermal distribution in direct metal laser sintering[J].Journal of Optoelectronics Laser,2005,16(4):492-495.沈显峰,姚进,王洋.金属粉末的直接选区激光烧结温度场数值模拟[J].电子激光,2005,16(4):492-495.
[16] BIANCO N,MANCA O,NARDINI S.Transient heat conduction in solids irradiated by a moving heat source[C].Proceeding of the COMSOL Users Conference,Italia:Milano,2006.
[17] GUTIERREZ G,ARAYA J G.Temperature distribution in a finite solid due to a moving laser beam[C].The American Society of Mechanical Engineers 2003International mechanical Engineering Congress and Exposition,Washington D C,2003:259-271.