High power and high beam quality quasi-continuous-wave pumped slab laser

Haozhu Wang; Xueyan Dong; Quanhao Chen; Xingwei Yan; Zilei Liu; Chenggong Zhang; Fengtu Yang

doi:10.1117/12.3016534

22 December 2023 High power and high beam quality quasi-continuous-wave pumped slab laser

Haozhu Wang, Xueyan Dong, Quanhao Chen, Xingwei Yan, Zilei Liu, Chenggong Zhang, Fengtu Yang

Proceedings Volume 12974, Fifth International Symposium on High Power Laser Science and Engineering (HPLSE 2023); 129740T (2023) https://doi.org/10.1117/12.3016534
Event: Fifth International Symposium on High Power Laser Science and Engineering, 2023, Suzhou, China

Abstract

We adopt a flat-concave resonant cavity structure, and the laser propagates along the Zigzag optical path in the slab. In order to effectively reduce the thermal lens effect in the thickness direction of the slab crystal and reduce the local thermal effect at the pump region, we propose a module structure under the mixed cooling mode. The large surface under the slab is welded in the microchannel cooling heat sink, and the large surface on the module is cooled by strong convection, so that the crystal surface is evenly cooled, and the thermal distortion in the thickness direction of the slab crystal is suppressed. On the other hand, We use the fast axis collimated semiconductor laser stack as the pump source, and the pump light is coupled to the slab to achieve a uniform distribution of the pump intensity, which is through the optical waveguide and the aspheric lens. When the pump power is 9500W, the average output power is 4.352kW, and the corresponding optical-to-optical conversion efficiency is 45.8%. The repetition rate is 400Hz, the laser pulse width is 180μs, and the single pulse energy is 10.88J. The laser beam βx is 3.4 times of the diffraction limit, and βy is 1.5 times of the diffraction limit.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Haozhu Wang, Xueyan Dong, Quanhao Chen, Xingwei Yan, Zilei Liu, Chenggong Zhang, and Fengtu Yang "High power and high beam quality quasi-continuous-wave pumped slab laser", Proc. SPIE 12974, Fifth International Symposium on High Power Laser Science and Engineering (HPLSE 2023), 129740T (22 December 2023); https://doi.org/10.1117/12.3016534

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KEYWORDS

Thermal effects

Crystals

High power lasers

Pulsed laser operation

Diffraction limit

Laser crystals

Mirrors

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