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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1.57μm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6ms。对于脉宽为30ns左右的激光脉冲,采样率为2GSa·s~(-1)时,测试系统的均方根误差不超过0.07 MHz。
Based on the optical heterodyne method, a set of pulsed laser center frequency real-time monitoring system is designed and built. The continuous light with known frequency characteristic is beat frequency with the single frequency nanosecond pulse light to be measured after the frequency shift. The synthesized light intensity signal is recorded with a photo detector and a data acquisition card, and the frequency spectrum of the beat signal is analyzed to acquire Metering center frequency information. The experiment uses a continuous single-frequency output 1.57μm laser as the reference light source. The test speed and test accuracy of the test system are evaluated by frequency shift, chopper and self-beat frequency. The response time of this system is 6ms. For a laser pulse with a pulse width of about 30ns, the RMSE of the test system does not exceed 0.07 MHz at a sampling rate of 2 GSa · s -1.