Mr. Xin He Profile

Xin He

at National Univ of Defense Technology

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Proceedings Article | 5 December 2011 Paper

Numerical analysis of fundamental mode selection of a He-Ne laser by a circular aperture

Xin He, Bin Zhang

Proceedings Volume 8197, 81970O (2011) https://doi.org/10.1117/12.904036

KEYWORDS: Mirrors, Resonators, Helium neon lasers, Interfaces, Diffraction, Zerodur, Finite element methods, Numerical analysis, Laser resonators, Optoelectronics

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In the He-Ne laser with an integrated cavity made of zerodur, the inner face performance of the gain tube is limited by the machining techniques, which tends to influence the beam propagation and transverse mode distribution. In order to improve the beam quality and select out the fundamental mode, an aperture is usually introduced in the cavity. In the process of laser design, the Fresnel-Kirchhoff diffraction integral equation is adopted to calculate the optical field distributions on each interface. The transit matrix is obtained based on self-reproducing principle and finite element method. Thus, optical field distribution on any interface and field loss of each transverse mode could be acquired by solving the eigenvalue and eigenvector of the transit matrix. For different-sized apertures in different positions, we could get different matrices and corresponding calculation results. By comparing these results, the optimal size and position of the aperture could be obtained. As a result, the feasibility of selecting fundamental mode in a zerodur He-Ne laser by a circular aperture has been verified theoretically.

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