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High-frequency intensity modulation in orthogonal polarized dual frequency lasers with optical feedback

机译：具有光反馈的正交偏振双频激光器中的高频强度调制

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摘要

High-frequency modulation of laser output intensity is studied with asymmetric feedback induced by the misalignment of an external feedback reflector in an orthogonal polarized dual frequency laser. The fringe frequency of the optical feedback system is seven times higher than that of a conventional optical feedback system, due to multiple feedback effects. The output characteristics of two orthogonal polarized modes are also investigated. Mode competition is observed between the two modes. When initial intensities of the two modes are unequal, the mode competition will be strong. The difference in initial intensity between the two orthogonally polarized modes plays an important role in the mode competition with optical feedback. Experimental results are presented, as well as a theoretical explanation. The high-frequency modulation of laser intensity can greatly increase the resolution of an optical feedback sensing system.
机译：研究了正交偏振双频激光器中外部反馈反射器未对准引起的不对称反馈对激光器输出强度的高频调制。由于多种反馈效应，光反馈系统的边缘频率比常规光反馈系统的边缘频率高七倍。还研究了两种正交偏振模的输出特性。在两种模式之间观察到模式竞争。当两种模式的初始强度不相等时，模式竞争将很激烈。两种正交偏振模式之间的初始强度差异在与光反馈的模式竞争中起着重要作用。给出了实验结果以及理论解释。激光强度的高频调制可以大大提高光学反馈传感系统的分辨率。

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