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远场激光光斑测量是研究高功率激光大气传输效应的有效方法,同时也是测试分析激光系统远距离瞄准能力的主要手段。设计了一种基于光电探测器阵列的高重复频率脉冲激光光斑分布探测阵列,实现了到靶激光总功率和光斑时空分布的定量测量。该探测阵列由297路Si-PIN光电探测器单元组成,其中心区域空间分辨力为1cm,有效探测尺寸为32cm、波长范围为300～1100nm。结果表明,该系统可用于最小脉冲宽度为10ns、重复频率为1～20kHz、动态范围为0.02～100μJ/cm2的脉冲光斑测量。
Far-field laser spot measurement is an effective method to study the atmospheric transmission effect of high-power laser and is also the main means of testing and analyzing the long-range aiming capability of the laser system. A detection array of high repetition frequency pulse laser spot distribution based on photodetector array was designed to realize the quantitative measurement of the total power and spot space-time distribution to the target laser. The probe array consists of 297 Si-PIN photodetector cells with a spatial resolution of 1 cm in the central region and an effective detection size of 32 cm in the wavelength range of 300 to 1100 nm. The results show that the system can be used to measure the pulse spot with the minimum pulse width of 10ns, the repetition frequency of 1 ~ 20kHz and the dynamic range of 0.02 ~ 100μJ / cm2.