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实验上观察到自混合干涉信号的幅度仅仅为静态光强的百分之几。反馈光会引起激光二极管阈值电流减小,静态输出光强变化几倍,使激光二极管工作在实际的阈值电流之上。按三镜法布里-珀罗腔结构模型计算激光二极管的出射光强,由干涉函数主极大条件得出光频与反馈光的关系。计算出的自混合干涉信号的波形,以及自混合干涉信号的幅度与静态光强的比值均同实验测量结果一致。在τrC/τi=22.8的情况下,复合谐振腔可同时有15个谐振模式,这些模随外腔长度的变化小于2.6×10-2cm-1,远小于法布里-珀罗谐振腔谐振模的线宽3.1cm-1,光频在内腔谐振模的线宽以内变化。
It is observed experimentally that the amplitude of the self-mixing interference signal is only a few percent of the static light intensity. Feedback light will cause the laser diode threshold current decreases, the static output light intensity changes several times, the laser diode work in the actual threshold current above. According to the three-mirror Fabry-Perot cavity model, the output light intensity of the laser diode is calculated, and the relationship between the optical frequency and the feedback light is obtained from the maximum condition of the interference function. The calculated self-mixing interference signal waveform and self-mixing interference signal amplitude and static light intensity ratio are consistent with the experimental measurements. In the case of τrC / τi = 22.8, there are 15 resonance modes in the composite resonator. The variation of these modes with the length of the external cavity is less than 2.6 × 10-2cm-1, which is much smaller than that of the Fabry-Perot resonant cavity 3.1cm-1 line width, the optical frequency within the resonant cavity line width within the change.