High-order LG vortex Pr:YLF laser emitting in the visible wavelength range for the measurement of angular velocity

Author:

Zhang Yu12ORCID,Yan Aoyu12,Qi Yaoyao123ORCID,Lü Jia-Qi12ORCID,An Jiashuo12ORCID,Sheng Quan4ORCID,Bai Zhenxu12,Wang Yulei12,Lu Zhiwei12

Affiliation:

1. Center for Advanced Laser Technology, Hebei University of Technology 1 , Tianjin 300401, China

2. Hebei Key Laboratory of Advanced Laser Technology and Equipment 2 , Tianjin 300401, China

3. Wuhan Raycus Co., Ltd. 3 , Wuhan 430223, China

4. Institute of Laser and Optoelectronics, School of Precision Instrument and Optoelectronics Engineering, Tianjin University 4 , Tianjin 300072, China

Abstract

High-order vortex beams carrying orbital angular momentum in the visible wavelength range are of tremendous interest for a diversity of applications, including super-resolution imaging, microfabrication, and underwater communications. Such beams can be generated directly from compact solid-state lasers; however, they generally have low topological charge number. In this work, we demonstrate the generation of high-order Laguerre–Gaussian (LG) modes from a simple Pr:YLF laser cavity and demonstrate its application in the measurement of angular velocity. We utilize enhanced intracavity spherical aberration to generate LG0,±m modes with m selectable up to 34, directly from a Pr:YLF laser operating at 640 nm. We utilize this laser beam in an off-axis illumination geometry in conjunction with the rotational Doppler effect, to measure the angular velocity of a spinning object. The demonstration highlights a potential application for these types of vortex laser.

Funder

National Natural Science Foundation of China

Hebei Natural Science Foundation

Natural Science Foundation of Tianjin

Hebei Science & Technology Research Project

China Postdoctoral Science Foundation under Grant

Publisher

AIP Publishing

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