Generation of coherent superpositions of LG0,±l modes with tunable topological charge in a Nd:YVO4 microchip laser

Author:

Wang Jinxiu1,Hu Miao1ORCID,Xu Mengmeng1,Li Haozhen1,Chen Shuying1,Zhou Xuefang1ORCID,Bi Meihua1,Pan Sunqiang2,Liu Chong3ORCID

Affiliation:

1. Hangzhou Dianzi University

2. Zhejiang Institute of Metrology

3. Zhejiang University

Abstract

The generation of a coherent superposition of LG0,±l modes within a Nd:YVO4 microchip laser pumped by a ring-shaped light based on a self-made annular aperture is reported. Numerical simulations are conducted on the threshold ratio of LG0,l modes with adjacent topological charges. In the experiment, the focusing lens is adjusted axially to vary the size of the ring-shaped pumping light within the microchip crystal, enabling mode matching between the pumping light and LG0,l modes of different topological charges. Ultimately, the coherent superposition of LG0,±l modes with continuously tunable topological charges ranging from 7 to 19 is achieved. This approach offers the advantages of simplicity, compactness, and flexibility, as it does not necessitate the special design of the resonant cavity.

Funder

Primary Research and Development Plan of Zhejiang Province

Key Research and Development Program of Zhejiang Province

Publisher

Optica Publishing Group

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