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Published on: November 22, 2019
183 WTEM00 mode acoustic-optic Q-switched MOPA laser at 850 kHz
Qiang Liu1, Xingpeng Yan, Xing Fu
1Department of Precision Instruments, State Key Laboratory of Tribology, Center for Photonics and Electronics, Tsinghua University, Beijing, China. qiangliu@mail.tsinghua.edu.cn
Abstract:
We report a high-power, high-repetition-rate TEM00 mode MOPA laser using acoustic-optic Q-switching. Seed laser from the dual-end- pumped Nd:YVO4 oscillator was scaled up to 183.5 W average power at 850 kHz after behind amplified by the four-stage power amplifiers. The stable Q-switching operation worked at different pulse repetition rate from 60 kHz to 850 kHz while the pulse duration increased from 12.8 ns to 72 ns. The beam quality was near diffraction-limit with M2 factors measured as M2x = 1.28 and M2y = 1.21. In CW operation, 195 W TEM00 mode output was achieved corresponding to the total optical-optical efficiency of 44.7% and the absorbed pump power to output power efficiency of 53.3% respectively.
