An Axicon-Based Annular Pump Acousto-Optic Q-Switched Nd:GdVO4 Self-Raman Vortex Laser

Author:

Liu Jie1,Duan Yanmin12,Mao Wenjie1ORCID,Jin Xinxin12,Li Zhihong12ORCID,Zhu Haiyong12ORCID

Affiliation:

1. Wenzhou Key Laboratory of Micro-Nano Optoelectronic Devices, Wenzhou University, Wenzhou 325035, China

2. Zhejiang International Sci-Tech Cooperation Base for Photoelectric Functional Devices and Digital Detections, Wenzhou 325035, China

Abstract

We report, for the first time, the generation of a 1173 nm acousto-optic Q-switched self-Raman vortex laser with an axicon-based annular pump system. A 20 mm long Nd:GdVO4 crystal was used as the self-Raman crystal. Both the fundamental field and the first-Stokes field were investigated using the respective output couplers. In comparison with both vortex fields, a noticeable beam cleaning-up effect and pulse compression were observed from the 1063 nm fundamental field to the 1173 nm first-Stokes field. A Stokes field carrying a unitary topological charge was achieved. Finally, the average output power of the first-Stokes vortex emission reached 454 mW under an incident pump power of 19.5 W, corresponding to a pulse width of 45.7 ns. It was beneficial to apply a high peak power from the Q-switched laser and self-Raman conversion to expand the applications of the vortex laser beam.

Funder

National Natural Science Foundation of China

Basic scientific research project of Wenzhou City

Publisher

MDPI AG

Subject

Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering

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