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Self-mixing interference effects of microchip Nd:YAG laser with a wave plate in the external cavity

机译：微芯片Nd：YAG激光器在外腔中带有波片的自混合干涉效应

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摘要

We present the optical feedback characteristics of a single-mode Nd:YAG laser with a wave plate in theexternal cavity. The laser intensities of the two orthogonal directions, which are both modulated by the change of external cavity length, have a phase difference due to the birefringence effect of the wave plate. When threshold intensity is introduced, a period of intensity fringe can be divided into four equal zones. Each zone corresponds to lambda/8 displacement of the external feedback reflector. The direction of displacement can be discriminated by the sequence of these four zones. This phenomenon provides a potential displacement sensor with directional discrimination and high resolution of eighth wavelength compared with the traditional optical feedback.
机译：我们提出了在外腔中带有波片的单模Nd：YAG激光器的光反馈特性。由于波片的双折射效应，两个正交方向的激光强度都由外腔长度的变化来调制，它们具有相位差。当引入阈值强度时，强度条纹的周期可以分为四个相等的区域。每个区域对应于外部反馈反射器的λ/ 8位移。位移的方向可以通过这四个区域的顺序来区分。与传统的光反馈相比，这种现象为电位位移传感器提供了方向辨别和第八波长的高分辨率。

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