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