A high energy end pumped Q-switched all solid state laser

Shiyong Xie; Zhenyu Zhou; Lin Mei; Caili Wang; Sanzhao Wang; Puguang Song; Xian Zhang; Yuechong Feng; Sheng Hong; Bingqiang Zhang

doi:10.1117/12.2574186

5 November 2020 A high energy end pumped Q-switched all solid state laser

Shiyong Xie, Zhenyu Zhou, Lin Mei, Caili Wang, Sanzhao Wang, Puguang Song, Xian Zhang, Yuechong Feng, Sheng Hong, Bingqiang Zhang

Author Affiliations +

Proceedings Volume 11562, AOPC 2020: Advanced Laser Technology and Application; 1156203 (2020) https://doi.org/10.1117/12.2574186
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

The high gain of pumping end in end-pumped all solid state lasers can easily cause self-excited oscillation, which limits the output energy of Q-switched laser. In order to obtain a 1064 nm Q-switched laser with high energy, high conversion efficiency and compact structure, the following three aspects are mainly studied to suppress the self-excited oscillation caused by the end pump: (1) the doping concentration of active particles is optimized to reduce the end gain of laser medium, (2) the wavelength of pump light is changed by adjusting temperature of laser diode to deviate from absorption peak of Nd:YAG, (3) Nd:YAG rod is processed by tapered side, which improves the difficulty of self-excited oscillation. By using the above techniques, a 1064 nm Q-switched laser with output energy of 100 mJ is obtained at a pump current of 20 Hz and 170 A, and the corresponding dynamic to static Q-switching ratio is 77%. The three technical means proposed in this study complement each other and work together, providing a practical and effective technical way for obtaining high-energy end pumped Q-switched laser.

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Shiyong Xie, Zhenyu Zhou, Lin Mei, Caili Wang, Sanzhao Wang, Puguang Song, Xian Zhang, Yuechong Feng, Sheng Hong, and Bingqiang Zhang "A high energy end pumped Q-switched all solid state laser", Proc. SPIE 11562, AOPC 2020: Advanced Laser Technology and Application, 1156203 (5 November 2020); https://doi.org/10.1117/12.2574186

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KEYWORDS

Nd:YAG lasers

Q switched lasers

Crystals

Laser crystals

Absorption

Pulsed laser operation

Aerosols

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