中国激光, 2018, 45 (8): 0804006, 网络出版: 2018-08-11
基于法布里-珀罗干涉仪的脉冲激光谱型测量 下载: 676次
Pulsed Laser Spectral Pattern Detection Based on Fabry-Perot Interferometer
激光光学 脉冲激光 谱型 法布里-珀罗干涉仪 激光雷达 laser optics pulsed laser spectral pattern Fabry-Perot interferometer lidar
摘要
脉冲激光谱型是大气风温探测激光雷达的重要参数之一,它的精确测量能够为激光雷达风温反演提供科学有效的数据。由于激光的重复频率通常为几十赫兹(重复周期为几十毫秒),而脉冲激光宽度仅为几纳秒,因此脉冲激光的线宽测量比连续激光困难得多。构造了一套基于法布里-珀罗干涉仪、窄脉冲信号门积分平均器、模数采样器等的脉冲激光谱型测量系统,并利用该系统完成了钠层风温激光雷达脉冲激光线宽的测量。利用该系统测量出该脉冲激光器的输出线宽约为123 MHz,与国外的测量结果120 MHz基本一致。该系统可搭载于激光雷达上用于实时监测激光谱型,能为确保测风激光雷达的精度和稳定性提供技术支撑。
Abstract
The spectral pattern of pulsed laser is one of the most important parameters for atmospheric wind and temperature lidar. Accurate detection of the spectral pattern of pulsed laser can provide scientific and effective data for wind and temperature inversion. Since the repetition rate of the laser is usually a few tens of hertz (the repetition period is a few tens of milliseconds) and the pulse width of laser is only a few nanoseconds, the linewidth measurement of pulsed laser is much more difficult than that of continuous laser. In this paper, a system based on Fabry-Perot interferometer (FPI), narrow pulse signal gate integral averager and modulus sampler is built, which can detect the spectral pattern of pulsed laser. The linewidth of the sodium layer wind and temperature lidar is detected by this system. The output linewidth of the pulsed laser is measured with the system to be approximately 123 MHz, which is basically consistent with the measurement result of 120 MHz in foreign countries. This system can be mounted on the lidar for real-time monitoring of the spectral pattern of laser, which can provide technical support for ensuring the accuracy and stability of the wind measurement lidar.
樊燚, 林兆祥, 程学武, 詹伟强. 基于法布里-珀罗干涉仪的脉冲激光谱型测量[J]. 中国激光, 2018, 45(8): 0804006. Fan Yi, Lin Zhaoxiang, Cheng Xuewu, Zhan Weiqiang. Pulsed Laser Spectral Pattern Detection Based on Fabry-Perot Interferometer[J]. Chinese Journal of Lasers, 2018, 45(8): 0804006.