激光与光电子学进展, 2019, 56 (14): 140502, 网络出版: 2019-07-12
涡旋光束轨道角动量的一种新型干涉检测方法 下载: 1424次
Interferometric Detection Method for Orbital Angular Momentum of Vortex Beams
光栅 涡旋光束 轨道角动量 干涉 空间光调制器 gratings vortex beams orbital angular momentum interference spatial light modulator
摘要
提出一种利用干涉实现涡旋光束轨道角动量简易检测的新方法。使用空间光调制器产生涡旋光束时,仅由调制的涡旋光束和未能完全调制的入射高斯光束即可直接发生同轴干涉,产生完美的花瓣状干涉图案,且干涉花瓣数量与涡旋光束携带的轨道角动量值一致,因此,检测由空间光调制器产生的涡旋光束轨道角动量时不需要额外使用参考干涉光。利用该干涉分析了Bessel-Gaussian光束和Laguerre-Gaussian光束的干涉图案,所得结果不仅能反映光束的轨道角动量值——角向因子,还能反映轨道角动量的正负以及Laguerre-Gaussian光束的径向因子,且干涉模式清晰,稳定性高。
Abstract
This study proposes a new method to detect the orbital angular momentum of vortex beams using interferometry. Experimentally, when a spatial light modulator is used to generate a vortex beam, coaxial interference directly occurs only by a modulated vortex beam and an incident Gaussian beam which is not fully modulated, producing a perfect petal-like interference pattern. The number of interfering petals coincides with the value of the orbital angular momentum carried by the vortex beam; thus, a separate reference beam is not required when we detect the orbital angular momentum of vortex beams produced by the spatial light modulator. This study analyzes the interference pattern of Bessel-Gaussian and Laguerre-Gaussian beams, which can reflect the orbital angular momentum of the beam, i.e., the azimuth factor and the positive and negative values of the orbital angular momentum together with the radial factor of the Laguerre-Gaussian beam. Notably, the interference results are clear, and the stability is high.
裴春莹, 茅志翔, 徐素鹏, 夏勇, 尹亚玲. 涡旋光束轨道角动量的一种新型干涉检测方法[J]. 激光与光电子学进展, 2019, 56(14): 140502. Chunying Pei, Zhixiang Mao, Supeng Xu, Yong Xia, Yaling Yin. Interferometric Detection Method for Orbital Angular Momentum of Vortex Beams[J]. Laser & Optoelectronics Progress, 2019, 56(14): 140502.