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采用单块非平面环形激光器作为种子,注入到单纵模运转的 Q 开关高重复频率 Nd:YAG 激光器为发射源,同时运用温度反馈控制,使种子光源和从动激光器自由振荡频率相匹配,实现稳定的单频输出。采用外差式相干探测的方法,测量运动目标的多普勒频移,从而达到测量运动物体速度信息的目的。根据实验现象,分析失谐频率△ω对外差探测的影响,提出了改进措施并应用于实验。比较已观测到的实验数据与理论计算值分析误差来源。
A single non-planar ring laser is used as a seed and injected into a single longitudinal mode Q-switched high-repetition rate Nd: YAG laser as the emitter, and the temperature feedback control is used to match the free-running frequency of the seed light source and the driven laser to achieve Single-frequency output stable. The method of heterodyne coherent detection is used to measure the Doppler frequency shift of the moving target so as to achieve the purpose of measuring the velocity information of the moving object. According to the experimental phenomena, the effect of detuning frequency △ ω on heterodyne detection is analyzed, and the improvement measures are put forward and applied to the experiment. Compare the observed experimental data with the theoretical calculation to analyze the source of error.