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Proceedings Paper

Numerical analysis of fundamental mode selection of a He-Ne laser by a circular aperture
Author(s): Xin He; Bin Zhang
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Paper Abstract

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.

Paper Details

Date Published: 5 December 2011
PDF: 8 pages
Proc. SPIE 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 81970O (5 December 2011); doi: 10.1117/12.904036
Show Author Affiliations
Xin He, National Univ. of Defense Technology (China)
Bin Zhang, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 8197:
2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Yunlong Sheng; Han-Ping Shieh; Kimio Tatsuno, Editor(s)

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