【作者】 李超；

【导师】 高勋；

【作者基本信息】 长春理工大学 ， 物理学， 2019， 硕士

【摘要】 近年来,随着光电技术的发展,CCD是光学成像系统、探测系统的核心部件,已经普遍用于日常生活、国防军事等领域。特别是在现代战争中,CCD也有着不可或缺的作用,高空侦察、红外制导、夜视装备以及安全监控等都依靠着CCD的成像功能。因此如何高效损伤CCD,对于军事中的光电对抗有着重要的意义。目前对激光损伤CCD的研究普遍利用的是脉冲激光或连续激光,二者对CCD的损伤效率均不高。所以,为了能够高效损伤CCD,利用纳秒脉冲/连续激光对CCD进行损伤研究有着一定的意义。本文主要开展了纳秒脉冲/连续激光对CCD损伤机理研究工作。基于热传导理论,利用有限元模拟软件COMSOL Multiphysics模拟计算了纳秒脉冲激光、连续激光和纳秒脉冲/连续激光辐照CCD过程中温度的变化,探讨了纳秒脉冲激光和连续激光的能量/功率和光斑半径对温升的影响规律以及纳秒脉冲注入时间对纳秒脉冲/连续激光作用CCD过程中的温升影响。随着激光能量密度/功率密度的增加,CCD中心点温度不断升高。开展纳秒脉冲激光和连续激光对CCD的损伤实验研究,在纳秒激光损伤CCD时,随着激光能量的增加,对于CCD功能损伤出现了点损伤、线损伤和面损伤(完全损伤),实验测量了CCD探测器的损伤阈值,发现表面形貌损伤阈值大于功能损伤阈值。连续激光损伤CCD时,CCD功能损伤只出现了面损伤。对于纳秒脉冲激光和连续激光损伤CCD研究结果表明,带有防护片的CCD探测器的功能损伤阈值和形貌损伤阈值要高于去除防护片情形。开展纳秒脉冲/连续激光损伤CCD的损伤实验研究,结果表明,相比于纳秒脉冲激光和连续激光损伤CCD而言,纳秒脉冲/连续激光作用CCD探测器降低了面损伤阈值。结合实验结果,解析了纳秒脉冲激光、连续激光以及纳秒脉冲/连续激光对CCD的损伤机理。更多还原

【Abstract】 In recent years,with the development of optoelectronic technology,CCD is the core component of optical imaging system and detection system,and it has been widely used in daily life,national defense and military fields.Especially in modern warfare,CCD also plays an indispensable role.High-altitude reconnaissance,infrared guidance,night vision equipment and safety monitoring rely on the imaging function of CCD.Therefore,it has been great significance for the photoelectric countermeasures that how to effectively damage the CCD in the military.At present,the research on laser-damaged CCD generally uses pulsed laser or continuous laser,and the damage efficiency of the two is not high.Therefore,in order to be able to damage the CCD efficiently,it is certain significance to use the nanosecond pulse/continuous laser for studying the damage of the CCD.In this paper,the research work of nanosecond pulse/continuous laser on CCD damage mechanism was carried out.Based on the theory of heat conduction,the finite element simulation software COMSOL Multiphysics was used to simulate the temperature changes during nanosecond pulsed laser,continuous laser and nanosecond pulse/continuous laser irradiation.The energy/power of nanosecond pulsed laser and continuous laser was discussed.And the influence of the spot radius on the temperature rise and the influence of the nanosecond pulse injection time on the temperature rise during the nanosecond pulse/continuous laser action CCD process.As the laser energy density/power density increases,the CCD center point temperature increased.Experiments on damage of CCD by nanosecond pulsed laser and continuous laser were carried out.In the nanosecond laser damage CCD,with the increase of laser energy,point damage,line damage and surface damage(completed damage)appeared in the CCD functional damage.The damage threshold of the CCD detector was measured and it was found that the surface topography damage threshold was greater than the functional damage threshold.When the continuous laser damages the CCD,only the surface damage occured in the CCD function damage.The results of nanosecond pulse laser and continuous laser damage CCD showed that the functional damage threshold and topographic damage threshold of the CCD detector with protective sheet were higher than that without protective sheet CCD.The damage experiment of nanosecond pulse/continuous laser damage CCD was carried out.Compared to nanosecond pulsed laser and continuous laser damage CCD,the result showed that the nanosecond pulse/continuous laser action CCD detector reduced the surface damage threshold.Combined with the experimental results,the damage mechanism of nanosecond pulsed laser,continuous laser and nanosecond pulse/continuous laser to CCD was analyzed.更多还原