重复脉冲激光辐照InSb(PV)型探测器的热损伤

在建立高斯型重复脉冲激光辐照InSb(PV)型探测器物理模型的基础上,采用近似解析解的形式计算了圆柱形InSb靶板的二维温度场。通过数值分析得出了在激光辐照时,InSb(PV)型探测器的温升与时间的关系,并计算出相应的损伤阈值。研究表明:在高斯型重复脉冲激光辐照下,损伤阈值受到脉冲数目、宽度、重复频率以及脉冲激光光斑半径的影响,InSb(PV)型探测器会发生熔融损伤,发生于迎光面的光斑中心。对于一定厚度胶层的InSb(PV)型探测器,只有强度大于一定阈值时重复脉冲激光的辐照才可能发生熔融损伤,越薄的胶层对应的损伤阈值越大。为了增加InSb(PV)型探测器的激光对抗能力,应该减小胶层厚度。

Thermal and Mechanical Dam age in InSb (PV) Detector Induced by Repetitive Pulse Laser

Physical model of InSb(PV) detector irradiated by repetitive pulses laser was established.The distribution of temperature was studied by Gauss beam with 2-D thermal model.The relationship of the temperature transformation with irradiated time was obtained.By numerical method,it was found that the damage of InSb material irradiated by repetitive pulses laser is influenced by the number,width,repetitive frequency and laser radius of pulse laser.In most condition,damage of InSb is took place firstly at the center of meeting-laser face.The higher the pulses laser power is,the less time of damage is needed.With the same power density laser,thiner sub need less irradiated time.For a definite sub,the damage threshold of laser must be higher than a special number for thiner sub.To improve the ability of anti-irradiation,it is necessary to minish the thickness of sub.