Control of self-excited oscillation by the LD temperature for end-pumped Nd:YAGQ-switched laser

Caili Wang; Shiyong Xie; Yu Shi; Xiaoxuan Shi; Hua Cai; Tiezhu Bo; Jiao Lian; Chen Wang; Chang Liu

doi:10.1117/12.2625578

27 March 2022 Control of self-excited oscillation by the LD temperature for end-pumped Nd:YAGQ-switched laser

Caili Wang, Shiyong Xie, Yu Shi, Xiaoxuan Shi, Hua Cai, Tiezhu Bo, Jiao Lian, Chen Wang, Chang Liu

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121699R (2022) https://doi.org/10.1117/12.2625578
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

For reducing the self-excited oscillation of end-pumped laser, the laser properties of 1064 laser is investigated with different temperature of the LD. The energy of the LD has no obvious change in the temperature range of 17.5°C to 30°C. When the LD temperature increases from 17.5°C to 30°C the peak wavelength of LD changes from 796.1nm to 799.2nm, and the corresponding wavelength variation coefficient with temperature is 0.25nm /°C. The output energy of the 1064nm laser are investigated with the LD temperature of 22.5°C, 25°C and 30°C. The experiment results indicate that output energy of the 1064nm laser increases continuously with the LD temperature of 22.5 ℃, the output energy is 83 mJ at the pump energy of 527 mJ, corresponding to the optical conversion efficiency of 15.7%, and no saturation occurs. The output energy of the 1064nm laser is saturated when the pump energy is greater than 498 mJ with the LD temperature of 25°C, and the output energy is 77 mJ at the pump energy of 527 mJ, corresponding to the optical conversion efficiency of14.6%.The output energy of the 1064 nm laser is saturated when the pump energy is greater than 382 mJ with the LD temperature of 30°,C and the output energy is 52.1 mJ at the pump energy of 409 mJ, corresponding to the optical conversion efficiency of 12.7%. The self-excited oscillation can be effectively suppressed by reducing gain of pump, and provide an effective technical means for obtaining high-energy end-pumped Q-switched laser output.

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Caili Wang, Shiyong Xie, Yu Shi, Xiaoxuan Shi, Hua Cai, Tiezhu Bo, Jiao Lian, Chen Wang, and Chang Liu "Control of self-excited oscillation by the LD temperature for end-pumped Nd:YAGQ-switched laser", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121699R (27 March 2022); https://doi.org/10.1117/12.2625578

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KEYWORDS

Q switched lasers

Nd:YAG lasers

Energy efficiency

Pulsed laser operation

Laser crystals

Crystals

LIDAR

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