Flexible measurement of high-order optical orbital angular momentum with a variable cylindrical lens pair

PLUTO / PLUTO-2 Spatial Light Modulators
Higher Order Modes / Optical Vortex / OAM Misc.: Speckle / Characterization / Metrology
Published on:
Authors: Jianneng Lu, Chongyang Cao, Zhuqing Zhu and Bing Gu
Abstract:

“We present a method to measure the high-order optical orbital angular momentum (OAM) with a variable cylindrical lens pair. The optical system consists of two cylindrical lenses with the opposite focal length. It produces a rotating position—spatial frequency transformation of phase modulation by changing the angle between the two cylindrical lenses. With this feature, the method can flexibly measure the OAM states of the vortex beams with different beam waists. The OAM states are determined by the number and direction of dark stripes of the diffraction pattern. The measurements of the topological charge and the radial index of Laguerre–Gaussian mode are demonstrated. As a compact high-order OAM measuring device, the variable cylindrical lens pair may find potential applications in optical communication._x000D_
This work was funded by the National Natural Science Foundation of China (Nos. 11774055 and 61875093), the Natural Science Foundation of Jiangsu Province of China (No. BK20181384) and the Natural Science Foundation of Tianjin of China (No. 19JCYBJC16500).”

Restricted Access

Publication: Applied Physics Letters
Issue/Year: Appl. Phys. Lett. Volume:116 (2020)
DOI: 10.1063/5.0002756
Link: https://doi.org/10.1063/5.0002756

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