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考虑激光器外腔由在不同方面上的独立运动的反射镜构成,形成多路反馈时所产生的自混合干涉(SMI)现象,运用光干涉的基础理论,结合激光自混合干涉理论对弱光反馈条件下的多路反馈外腔(MFEC)结构的自混合干涉理论进行研究。基于两路反馈外腔结构,构造了一个含有两路反馈外腔结构的自混合干涉模型,并对所提出的结构进行理论分析及数值仿真。得出在弱光反馈条件下,两路反馈外腔结构的自混合干涉信号类似于低频率正弦相位调制的激光自混合干涉信号,为幅度周期性变化的类正弦波或类锯齿波,其干涉信号波形形状由外部反馈的强弱决定,且一个周期内的波形信号疏密程度不同。搭建相关实验系统,对仿真结果进行了验证。
The self-mixing interference (SMI) phenomenon caused by multi-channel feedback is considered when the external cavity of the laser is composed of mirrors with independent movement in different aspects. By using the basic theory of optical interference and the theory of laser self-mixing interference, Conditions of multi-channel feedback external cavity (MFEC) structure of self-mixing interference theory. Based on two feedback external cavity structures, a self - mixing interference model with two feedback external cavity structures is constructed. The theoretical analysis and numerical simulation of the proposed structure are carried out. The results show that the self-mixing interference signals of the two feedback external cavity structures are similar to the laser self-mixing interference signals of low frequency sinusoidal phase modulation under low light feedback conditions, and they are sinusoidal or serogroup-like sawtooth waves whose amplitude changes periodically. The shape of the signal waveform is determined by the strength of the external feedback, and the degree of density of the waveform signal in one cycle is different. Set up the relevant experimental system, verify the simulation results.