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从三镜法布里-珀罗(F-P)腔出发,建立了非准直外腔三重回馈自混合干涉的理论模型,并进行了数值模拟和实验验证。分析了3种情况下影响自混合干涉光强调谐特性的因素:1)准直外腔二,三重回馈;2)非准直外腔二,三重回馈;3)外腔加入λ/4波片时的回馈。实验结果与理论分析相吻合。研究表明,该自混合干涉系统的分辨率达到λ/6;自混合干涉输出信号与腔反射镜的反射率、外腔的准直性以及腔内置入镜片有关;外腔中加入λ/4波片时的自混合干涉信号与非准直外腔自混合干涉信号类似;二,三重回馈自混合干涉信号携带了反射体位移方向信息,因而更易实现位移方向判断。
Starting from the three-mirror Fabry-Perot (F-P) cavity, a theoretical model of triple feedback self-mixing interference in non-collimation cavity was established, and the numerical simulation and experimental verification were carried out. The factors that affect the self-mixing interference intensity tuning characteristics are analyzed in this paper: 1) two and three feedbacks of collimated external cavity; 2) triple and triple feedback of non-collimated external cavity; and 3) external λ / 4 waveplate When the feedback. The experimental results are consistent with the theoretical analysis. The results show that the resolution of the self-mixing interference system reaches λ / 6; the self-mixing interference output signal is related to the reflectivity of the cavity mirror, the collimation of the external cavity and the lens built into the cavity; The self-mixing interference signal is similar to the non-collimation external cavity self-mixing interference signal. Second, the three-feedback self-mixing interference signal carries the information about the displacement direction of the reflector, which makes it easier to determine the direction of displacement.