A VCSEL end-pumped high-energy Q-switched Nd:YAG laser

Shiyong Xie; Caili Wang; Xiaoxuan Shi; Tiezhu Bao; Hua Cai

doi:10.1117/12.2625043

27 March 2022 A VCSEL end-pumped high-energy Q-switched Nd:YAG laser

Shiyong Xie, Caili Wang, Xiaoxuan Shi, Tiezhu Bao, Hua Cai

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121697L (2022) https://doi.org/10.1117/12.2625043
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

High energy Q-switched 1064 nm laser output is obtained by vertical cavity surface emitting laser (VCSEL) end pumping Nd:YAG. Compared with edge emitting diode laser, the VCSEL is more suitable to generate high efficiency and compact lasers as the pump source for the advantages of same divergence angle in each direction and small wavelength shift with temperature. 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 two 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) 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 80 mJ is generated under pump energy of 400 mJ, corresponding to optical conversion efficiency of 20%. The laser pulse width is 9 ns and divergence angle is 1.3 mrad. The corresponding dynamic to static Q-switching ratio is 75%. The two 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.

Citation Download Citation

Shiyong Xie, Caili Wang, Xiaoxuan Shi, Tiezhu Bao, and Hua Cai "A VCSEL end-pumped high-energy Q-switched Nd:YAG laser", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121697L (27 March 2022); https://doi.org/10.1117/12.2625043

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KEYWORDS

Vertical cavity surface emitting lasers

Nd:YAG lasers

Crystals

Q switched lasers

Laser crystals

Absorption

Neodymium

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