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Proceedings Paper

The study of stability on a laser-diode-pumped high-power high-repetition-rate intracavity frequency-doubled 532-nm laser
Author(s): Shi-yong Zhao; Jian-Quan Yao; De-gang Xu; Rui Zhou; Bai-gang Zhang; Jia-ning Zhou; Peng Wang
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Paper Abstract

High power laser-diode-pumped 532nm laser sources (including continuous wave and high repetition rate operation) are directly used for precise processing of metals and plastics. Furthermore, high power green laser will be used in some fields such as ocean exploration, laser probe and underwater communication. Recently, we reported a 110W diode-side-pumped Nd:YAG intracavity frequency doubled high stability 532nm laser. In the experiment, we found that the average output power of second harmonic fluctuated acutely with the variety of pumping current. Moreover, the length of arms between the mirrors were very sensitive to this cavity. We consider that one of the reason is the focus length of thermal lens of Nd:YAG rod alter with the variational pumping current, which makes the cavity be unstable. We consider the KTP crystal as a thin lens for its short length. As thermal lensing effect of the Nd:YAG rod is quite severe, so we consider it as thermal lensing medium. By ray matrix methods, we have obtained the stable regions and beam waist radii distribution in the flat-concave cavity. In our experiment, we used a pump head consisting of 80 diode bars with pentagon pump model and employed flat-concave cavity structure in order to achieve high stability output and increase output power. The total cavity length is 505mm. By using an acousto-optic Q-switching with high diffraction loss and the KTP crystal which is type II phase matching, 110 W high stability 532nm laser is achieved. The experimental result is in good agreement with the calculation.

Paper Details

Date Published: 26 January 2005
PDF: 7 pages
Proc. SPIE 5627, High-Power Lasers and Applications III, (26 January 2005); doi: 10.1117/12.574978
Show Author Affiliations
Shi-yong Zhao, Tianjin Univ. (China)
Jian-Quan Yao, Tianjin Univ. (China)
Cooperated Institution of Nankai Univ. and Tianjin Univ. (China)
De-gang Xu, Tianjin Univ. (China)
Rui Zhou, Tianjin Univ. (China)
Bai-gang Zhang, Tianjin Univ. (China)
Jia-ning Zhou, Tianjin Univ. (China)
Peng Wang, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 5627:
High-Power Lasers and Applications III
Dianyuan Fan; Ken-ichi Ueda; Jongmin Lee, Editor(s)

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