中国激光, 2017, 44 (11): 1101003, 网络出版: 2017-11-17   

单频纳秒脉冲激光中心频率实时监测技术 下载: 805次

Real-Time Monitoring Technology for Center Frequency of Single-Frequency Nanosecond Pulse Laser
作者单位
1 中国科学院上海光学精密机械研究所空间激光信息传输与探测技术重点实验室, 上海 201800
2 中国科学院大学, 北京 100049
摘要
基于光学外差法, 设计并搭建了一套脉冲激光中心频率实时监测系统。频率特性已知的连续光经移频后与待测的单频纳秒脉冲光发生拍频, 用光电探测器和数据采集卡记录合成光强信号, 分析拍频信号的频谱, 即可获取待测光的中心频率信息。实验用一台连续单频输出1.57 μm激光器作为参考光源, 采用移频、斩波、自拍频的方法对测试系统的测试速率和测试精度进行了评估, 得出该系统的响应时间为6 ms。对于脉宽为30 ns左右的激光脉冲, 采样率为2 GSa·s-1时, 测试系统的均方根误差不超过0.07 MHz。
Abstract
A real-time monitoring system for center frequency of pulse laser is designed and built based on the optical heterodyne method. The single-frequency nanosecond pulse laser to be measured is mixed with a frequency-shifted continuous reference beam whose spectrum characteristics are known, and a light intensity signal is generated, which is then recorded by a photodetector and a data acquisition card. The center frequency information of the pulse laser can be calculated according to the spectrum of the beat signal. Measurement rate and precision of this system are evaluated through the method of frequency shifting, chopping and self-heterodyne, which uses a 1.57 μm continuous single-frequency laser as a reference beam. Experimental results show that the response time of the system is 6 ms, and the root-mean-square error is less than 0.07 MHz when the width of laser pulse is around 30 ns and the sampling rate is 2 GSa·s-1.

陈晓, 谢小兵, 谢伟, 李世光, 马秀华, 朱小磊, 刘继桥, 陈卫标. 单频纳秒脉冲激光中心频率实时监测技术[J]. 中国激光, 2017, 44(11): 1101003. Chen Xiao, Xie Xiaobing, Xie Wei, Li Shiguang, Ma Xiuhua, Zhu Xiaolei, Liu Jiqiao, Chen Weibiao. Real-Time Monitoring Technology for Center Frequency of Single-Frequency Nanosecond Pulse Laser[J]. Chinese Journal of Lasers, 2017, 44(11): 1101003.

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