脉冲激光器高灵敏功率检测系统设计  

Design of High Sensitive Power Detection System for Pulsed Laser

作　　者：王秋卜 刘文清 张天舒[1,2] 付毅宾 Wang Qiubu;Liu Wenqing;Zhang Tianshu;Fu Yibin(Institute of Physical Science and Information Technology,Anhui University,Hefei,Anhui 230601,China;Key Laboratory of Environment Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei,Anhui 230031,China)

机构地区：[1]安徽大学物质科学与信息技术研究院,安徽合肥230601 [2]中国科学院安徽光学精密机械研究所环境光学与技术重点实验室,安徽合肥230031

出　　处：《激光与光电子学进展》2021年第3期228-235,共8页Laser & Optoelectronics Progress

基　　金：安徽省自然科学基金(1908085QD160,1908085QD170);安徽省科技重大专项(18030801111);安徽省重点研究与开发项目计划(202004i07020002)。

摘　　要：出射激光脉冲功率的变化对大气激光雷达数据采集的准确度具有很大的影响,因此需要对脉冲激光器功率进行准确的检测。基于出射激光脉冲窄脉宽、高重复频率的特点,提出一种针对窄脉冲激光器的功率检测系统。首先,采用光电二极管构成的光电转换电路实现对激光信号的光电转换;其次,采用跨导型峰值保持电路对激光单脉冲进行峰值保持;最后,通过同步触发信号实现单片机对峰值的采集,测出脉冲激光器出射脉冲的功率。经实验测试,该系统适用于大气激光雷达使用的脉宽为10 ns、重复频率为10 kHz、波长为532 nm的激光脉冲功率检测,且测试结果与标准激光功率计相比具有良好的线性关系和精度,满足应用需求。The change of the outgoing laser pulse power has a great influence on the accuracy of atmospheric lidar data collection,so it is necessary to detect the power of pulsed laser accurately.Based on the characteristics of the narrow pulse width and high repetition frequency of the outgoing laser pulse,we proposes a power detection system for narrow pulsed laser.First,the photoelectric conversion circuit composed of photodiodes is used to realize the photoelectric conversion of the laser signal.Second,the transconductance type peak hold circuit is used to hold the peak value of the laser single pulse.Finally,the synchronous trigger signal is used to collect the peak value of the single chip and measure the outgoing pulse power of the pulsed laser.After experimental testing,the system is suitable for power detection of laser pulses with a pulse width of 10 ns,a repetition frequency of 10 kHz,and a wavelength of 532 nm used by atmospheric lidar.The test results have good linear relationship and accuracy compared with standard laser power meters,which can meet application requirements.

关 键 词：激光器 窄脉冲激光 峰值保持电路 跨导放大器 光电二极管 

分 类 号：TN29[电子电信—物理电子学]