基于少模光纤的轴对称偏振光束的产生

首先介绍了轴对称偏振光束的基本概念以及特性, 然后以少模光纤为模式转换器, 通过旋转偏振控制器上光纤挤压器的旋钮对光纤中间部分施加压力, 同时配合旋转光纤挤压器, 以实验的方式获得了不同模式的轴对称偏振光束。通过调节偏振控制器以及输入光束和光纤的离轴状态, 分别得到了径向偏振TM01模式, 角向偏振TE01模式, 奇数混合偏振HEodd21模式, 偶数混合偏振HEeven21模式, 以及线偏振HE11模式五种光纤所激发的模式。同时, 还通过干涉实验中叉形光栅结构证明了相位奇点的存在。

Abstract

This paper first introduces the basic concept and features of axially symmetric polarized beams.A few-mode fiber is used as the mode converter.Pressure is added to the middle part of the fiber by spinning the knob of fiber squeezer of polarization controller.By coupling with rotating fiber squeezer, different mode of axially symmetric polarized beams was obtained in the experiment.By adjusting the polarization controller and the off-axis conditions of the input beam and fiber, the radially polarized TM01 mode, azimuthally polarized TE01 mode, odd hybrid polarized HEodd21mode, even hybrid polarized HEeven21 mode, and linearly polarized two-lobe mode were separately excited at five different accommodative status.We also checked the existence of phase singularity through the fork grating structure in the interfere experiment simultaneously.

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杨凯歌, 耿滔. 基于少模光纤的轴对称偏振光束的产生[J]. 光学仪器, 2017, 39(3): 33. YANG Kaige, GENG Tao. Formation of axially symmetric polarized beams using few-mode fiber[J]. Optical Instruments, 2017, 39(3): 33.

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