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单频脉冲激光器的频率稳定性显著地影响直接探测多普勒激光雷达的风速测量准确性,工作在半导体抽运Nd…YAG激光器倍频532nm的种子注入脉冲激光器的典型自由频率漂移可达15MHz/min,相当于4m/s风速误差。基于碘分子吸收光谱稳频原理,采用Labview虚拟仪器控制技术,对种子注入脉冲放大式的半导体抽运Nd…YAG激光器进行稳频,实现了脉冲激光器的频率扫描、碘分子1109光谱吸收线的自动匹配和频率锁定。长时间(大于2h)频率漂移标准偏差为0.8MHz,等效风速误差为0.2m/s,达到直接探测多普勒测风激光雷达长时间测量对脉冲激光器的频率稳定要求。
The frequency stability of a single-frequency pulsed laser significantly affects the wind speed measurement accuracy of the direct-probe Doppler lidar. The typical free-frequency drift of a seed-injected pulsed laser operating at a frequency of 532 nm in a semiconductor-pumped Nd: YAG laser can reach 15 MHz / min, equivalent to 4m / s wind speed error. Based on the frequency stabilization principle of iodine molecular absorption spectroscopy, Labview virtual instrument control technology was used to stabilize the frequency of the pulsed laser Nd: YAG laser by injecting a pulsed amplified semiconductor into the Nd: YAG laser. The spectrum of iodine molecule 1109 was automatically absorbed Matching and frequency locking. Long time (more than 2h) frequency drift standard deviation of 0.8MHz, equivalent wind speed error of 0.2m / s, to achieve direct detection Doppler wind lidar long pulse laser pulse frequency stability requirements.