Effect of Nd:YAG concentration on dynamic to static ratio of high energy end pumped Q-switched laser

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

doi:10.1117/12.2625037

27 March 2022 Effect of Nd:YAG concentration on dynamic to static ratio of high energy end pumped Q-switched laser

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

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121697K (2022) https://doi.org/10.1117/12.2625037
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Laser diode (LD) end pumped Nd:YAG laser is easy to cause self-excited oscillation due to its high pump end gain, which affects the dynamic to static ratio, resulting in unable to output high-energy pulse laser. In this paper, the effect of Nd:YAG concentration on dynamic to static ratio of LD end pumped Q-switched laser is studied. Combined with theoretical simulation and experimental study, it is found that reducing the concentration of Nd:YAG crystal can effectively suppress the self-excited oscillation and obtain a high Q-switched dynamic to static ratio. However, the low concentration of Nd:YAG will also affect the absorption of pump light, which makes it difficult to obtain high-energy laser output. On the other hand, increasing the length of Nd:YAG crystal can improve the absorption of pump light. However, at the same time, the scattering loss will increase. When the scattering loss exceeds the gain of pump light, the output laser energy will decrease. Based on the above theory and experimental results, the optimized concentration and length of Nd:YAG crystal is 0.6% and 40 mm. Finally, the output of 1064 nm laser with pulse energy of 64 mJ and pulse width of 8 ns is obtained, and the corresponding Q-switched dynamic to static ratio is 55%. The self-excited oscillation can be effectively suppressed by optimizing the concentration of Nd:YAG crystal, which provides an effective technical means for obtaining high-energy end pumped Q-switched laser output.

Citation Download Citation

Shiyong Xie, Caili Wang, Xiaoxuan Shi, Tiezhu Bao, and Hua Cai "Effect of Nd:YAG concentration on dynamic to static ratio of high energy end pumped Q-switched laser", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121697K (27 March 2022); https://doi.org/10.1117/12.2625037

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KEYWORDS

Nd:YAG lasers

Q switched lasers

Crystals

Laser crystals

Absorption

Pulsed laser operation

Doping

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