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为了探讨二极管激光自混合是否可用于高速(km/s)物体的速度测量,对二极管激光自混合测速上限(MMV)问题进行了理论分析。基于三镜腔模型得到了激光器输出功率波动频率与多普勒频率的关系,从载流子密度和光子密度的速率方程出发,将外部反馈光引入的扰动看成是以多普勒频率对激光器产生的小信号调制,得到激光自混合测速上限受激光器弛豫谐振频率大小限制的结论;根据理论分析,测速上限可达千米每秒。
In order to investigate whether the diode laser self-mixing can be used to measure the velocity of high-speed (km / s) objects, theoretical analysis of diode laser self-mixing velocity limit (MMV) is carried out. Based on the three-cavity model, the relationship between the laser output power fluctuation frequency and the Doppler frequency was obtained. From the rate equations of carrier density and photon density, the perturbations introduced by the external feedback light were regarded as the Doppler- Resulting in a small signal modulation, the laser self-mixing speed limit by the upper limit of the laser resonance frequency relaxation limit the conclusion; according to the theoretical analysis, the upper speed limit up to kilometers per second.