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较详细地研究了腔内CdTe电光调QCO2 窄脉冲激光及其外差信号的时域频域特性,发现它的激光脉冲时域波形有很长的拖尾,拖尾持续时间与CdTe晶体外触发电压开关宽度有关,触发宽度越宽拖尾越长,反之则短。进行了调QCO2 脉冲激光微弱信号检测实验,即将脉冲激光衰减到用直接探测方法无法检测的程度,此时再用外差检测方法,在脉冲包络之内及其拖尾部分观察到了较强的外差中频信号,从实验上验证了外差探测灵敏度远远高于直接探测。根据该激光脉冲拖尾持续时间部分可控的特性,从理论上讨论了CO2 连续激光本振和窄脉冲主振激光外差中频信号频率跟踪和偏频锁定的可行性
The time-domain frequency-domain characteristics of the Q-switched narrow-band laser and its heterodyne signal of CdTe electro-optic QCM were studied in detail. It was found that the laser pulse time-domain waveform had a long tail, Voltage switch width, the trigger width of the trailing longer, otherwise short. The QMC2 pulsed laser weak signal detection experiment was carried out, ie, the pulse laser was attenuated to the extent undetectable by the direct detection method. At this moment, the heterodyne detection method was used to detect the pulsed laser within the pulse envelope and its trailing part Heterodyne IF signal, from the experimental verification of heterodyne detection sensitivity is much higher than the direct detection. Based on the controllable characteristics of the laser pulse tailing duration, the feasibility of frequency tracking and bias lock of CO2 continuous laser local oscillator and narrow pulse main laser heterodyne IF signal is theoretically discussed