引入激光回馈的双光束干涉效应的研究

提出了一种引入He-Ne激光回馈的双光束干涉系统,并在理论和实验两方面进行了研究。实验中对系统中的干涉信号及激光器尾光功率变化同时进行探测。发现当干涉仪的主回馈镜移动时,激光器尾光信号是正弦形波形,而干涉仪输出的是以双峰为一个周期的信号,双峰中一峰总是高于另一峰,并且当主回馈镜移动方向改变时,同一周期中两峰出现的顺序也随之改变。对实验现象进行了理论分析,并模拟出干涉信号及激光自身功率的变化曲线。理论分析及模拟结果与实验结果完全吻合。讨论了利用发现的现象进行测量的可行性,所提出的测量方法易于实现。

Interference of two beams in a He-Ne laser with optical feedback

This article makes a research in theory and experiment on the changes of the interference signal and the laser intensity of an interferometer with optical feedback in a He Ne laser.When the main feedback mirror moves,the curve of the laser output intensity is a sine wave but the interference signal is a curve with two peaks in a period.One peak is higher than the other one.When the feedback mirror changes its moving direction,the order that the two peaks come out will change too.The article analyses the experimental results in theory and simulates the interference signal and the laser intensity signal.The simulation results are in good agreement with the experiment results.A measuring method is discussed which can judge the moving direction of the moving object easily and this method is easy to be realized.