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Proceedings Paper

Nd:YAG thin-disk laser with large dynamic range unstable resonance
Author(s): Jianli Shang; Yi Yu; Xiangchao An; Qingsong Gao; Chun Tang
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Paper Abstract

In this paper, based on the self-reproduction condition of laser wavefront curvature, the influences of disk defocus on laser parameters can be calculated. The laser-pumping overlapping efficiency will decrease by 9%; the magnification will rise to 2.3, and the intra-cavity loss will be high to 30% due to a laser beam size mismatch when each disk has focal length of -100 m in a positive-branch confocal unstable resonator containing four disks with magnification of 1.8. Therefore, the optical conversion efficiency and stability will be reduced significantly. Several methods defocus compensation of are compared, it can be found that inserting variable-focus lens in resonant is useful in large dynamic range. In experiment, the defocus values are measured in different pumping power. A lens group, used for compensate components according to the single pass probe, is carefully designed. Under this compensation, the pulse energy can be maintained in 10 J from 1 Hz to 100 Hz. The output power can be improved 2.33 times compared to non-compensation condition.

Paper Details

Date Published: 3 February 2015
PDF: 9 pages
Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92550R (3 February 2015); doi: 10.1117/12.2065499
Show Author Affiliations
Jianli Shang, Institute of Applied Electronics (China)
Yi Yu, Institute of Applied Electronics (China)
Xiangchao An, Institute of Applied Electronics (China)
Qingsong Gao, Institute of Applied Electronics (China)
Chun Tang, Institute of Applied Electronics (China)

Published in SPIE Proceedings Vol. 9255:
XX International Symposium on High-Power Laser Systems and Applications 2014
Chun Tang; Shu Chen; Xiaolin Tang, Editor(s)

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