Control of self-excited oscillation by Nd3+ ion doping concentration for end-pumped NdYAG Q-switched laser

Cai-li Wang; Lin Mei; Zhen-yu Zhou; Shi-yong Xie; Pu-guang Song; Kai-yu Li; Xiao-feng Tang; Juan Liu; Sheng Hong; Bing-qiang Zhang

doi:10.1117/12.2575816

5 November 2020 Control of self-excited oscillation by Nd³⁺ ion doping concentration for end-pumped NdYAG Q-switched laser

Cai-li Wang, Lin Mei, Zhen-yu Zhou, Shi-yong Xie, Pu-guang Song, Kai-yu Li, Xiao-feng Tang, Juan Liu, Sheng Hong, Bing-qiang Zhang

Author Affiliations +

Proceedings Volume 11562, AOPC 2020: Advanced Laser Technology and Application; 115620D (2020) https://doi.org/10.1117/12.2575816
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

For reducing the self-excited oscillation of end-pumped laser, the laser properties of the end-pumped Nd:YAG Q-switched laser is investigated with different Nd³⁺ ion doping concentration. The experiment results indicate that the output energy of the end-pumped Nd:YAG Q-switched laser is saturated when the pump energy is greater than 467mJ with 0.6% Nd³⁺ ion doping concentration, and the maximum output energy of 62.9mJ is generated under the pump energy of 498mJ, corresponding to the optical conversion efficiency of 12.6%. When the Nd³⁺ ion doping concentration decreases to 0.4%, the output energy of the end-pumped Nd:YAG Q-switched laser increases continuously with increasing pumping energy, the output energy is up to 64.7mJ under the pump energy of 498mJ, corresponding to the optical conversion efficiency of 13.0%, and no saturation occurs. By optimizing the structure parameters of the pump system, a 82.1mJ 10ns 1064nm laser is obtained under the pump energy of 527mJ, corresponding to the optical conversion efficiency of 15.6%. In view of the saturation of output energy in the end-pumped Nd:YAG Q-switched laser, Nd³⁺ ion doping concentration adjustment is carried out to reduce the pump end-face gain of laser medium, the self-excited oscillation can be effectively suppressed, an effective technical means for obtaining high-energy end-pumped Q-switched laser output is provided.

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Cai-li Wang, Lin Mei, Zhen-yu Zhou, Shi-yong Xie, Pu-guang Song, Kai-yu Li, Xiao-feng Tang, Juan Liu, Sheng Hong, and Bing-qiang Zhang "Control of self-excited oscillation by Nd³⁺ ion doping concentration for end-pumped NdYAG Q-switched laser", Proc. SPIE 11562, AOPC 2020: Advanced Laser Technology and Application, 115620D (5 November 2020); https://doi.org/10.1117/12.2575816

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KEYWORDS

Q switched lasers

Nd:YAG lasers

Doping

Ions

Neodymium

Energy efficiency

Pulsed laser operation

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