The study of stability on a laser-diode-pumped high-power high-repetition-rate intracavity frequency-doubled 532-nm laser

Shi-yong Zhao; Jian-Quan Yao; De-gang Xu; Rui Zhou; Bai-gang Zhang; Jia-ning Zhou; Peng Wang

doi:10.1117/12.574978

26 January 2005 The study of stability on a laser-diode-pumped high-power high-repetition-rate intracavity frequency-doubled 532-nm laser

Shi-yong Zhao, Jian-Quan Yao, De-gang Xu, Rui Zhou, Bai-gang Zhang, Jia-ning Zhou, Peng Wang

Author Affiliations +

Proceedings Volume 5627, High-Power Lasers and Applications III; (2005) https://doi.org/10.1117/12.574978
Event: Photonics Asia, 2004, Beijing, China

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.

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Shi-yong Zhao, Jian-Quan Yao, De-gang Xu, Rui Zhou, Bai-gang Zhang, Jia-ning Zhou, and Peng Wang "The study of stability on a laser-diode-pumped high-power high-repetition-rate intracavity frequency-doubled 532-nm laser", Proc. SPIE 5627, High-Power Lasers and Applications III, (26 January 2005); https://doi.org/10.1117/12.574978

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