原子法拉第效应器件稳频与鉴频的测速多普勒激光雷达

A Doppler lidar with atomic Faraday devices frequency stabilization and discrimination

利用法拉第反常色散滤光器(FADOF)透射频谱曲线稳定而又可调谐的特点,设计了一种测速多普勒激光雷达,一方面用其对发射激光稳频,同时用同种原子的FADOF对回波光鉴频,使发射激光频率和鉴频曲线建立相对稳定的关系,可有利于提高测速精度。试验系统采用Cs原子FADOF,在-40～40 m/s的测速范围内,测速误差为±0.74 m/s。

A Doppler lidar was reported in which the laser frequency is stabilized and the backscattered light frequency is discriminated by a multi-peak and less-peak atomic Faraday anomalous dispersion optical filter （FADOF）, respectively. The transmission spectrum of FADOF is stable as it is based on an atomic transition, and slightly tunable with a magnet due to Zeeman effect. The high frequency stability of FADOF provides a high velocity accuracy, and the tunability of FADOF transmission spectrum makes the measurement range flexible. An experimental lidar system was described based on cesium FADOFs, and the experimental error is of 0.74 m/s over velocities ranging from -40 to 40 m/s.