High power Nd:YAG ceramic lasers: passive Q-switching and frequency doubling

Ruijun Lan; Robert Fedosejevs; Hong Liu; Zhengping Wang; Yaohui Lv; Yuanhua Sang; Haohai Yu; Jiyang Wang

doi:10.1117/12.839626

4 August 2009 High power Nd:YAG ceramic lasers: passive Q-switching and frequency doubling

Ruijun Lan, Robert Fedosejevs, Hong Liu, Zhengping Wang, Yaohui Lv, Yuanhua Sang, Haohai Yu, Jiyang Wang

Proceedings Volume 7386, Photonics North 2009; 738634 (2009) https://doi.org/10.1117/12.839626
Event: Photonics North 2009, 2009, Quebec, Canada

Abstract

A high power passive Q-switched laser and a continuous-wave (CW) green laser both with a neodymium-doped yttrium aluminum garnet (Nd:YAG) ceramic as the laser material have been demonstrated. Two Cr⁴⁺:YAG crystals with 73.9% and 79.6% initial transmission at 1064 nm have been used as saturable absorbers. In Q-switched regime the laser generated up to 209 μJ, 4.5 ns pulses, which corresponds to a peak power of 46.8 kW. In CW regime at 1064 nm the laser generated 11.3 W of output power at a pump power of 21.6 W, corresponding to an optical-optical conversion efficiency of 52.3%. By using a type-II cut KTP crystal, the CW frequency-doubled operation of Nd:YAG ceramic was achieved. The maximum output power of 1.86 W at 532 nm has been obtained. The one-dimensional intensity distribution of the green beam cross-section was observed to be Gaussian. When the output power was 1 W, the M2 factor was measured to be 1.7.

Citation Download Citation

Ruijun Lan, Robert Fedosejevs, Hong Liu, Zhengping Wang, Yaohui Lv, Yuanhua Sang, Haohai Yu, and Jiyang Wang "High power Nd:YAG ceramic lasers: passive Q-switching and frequency doubling", Proc. SPIE 7386, Photonics North 2009, 738634 (4 August 2009); https://doi.org/10.1117/12.839626

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