Chinese Journal of Lasers, Vol. 47, Issue 4, 0415001 (2020)
550-W Single-Frequency All-Fiber Amplifier with Near-Diffraction-Limited Beam Quality
Lai Wenchang, Ma Pengfei*, Liu Wei, Huang Long, Li Can, and Zhou Pu**
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, Hunan 410073, China
In this study, a 550-W single-frequency all-fiber laser with near diffraction-limited beam quality is achieved by simultaneously suppressing the stimulated Brillouin scattering and mode instability effects with a long-tapered gain fiber and employing the ability of high mode instability threshold of 1030-nm signal laser. The slope efficiency of the whole amplifier is observed to be as high as 80% and the measured beam quality M2 is approximately 1.47 at the maximum output power. Further brightness scaling is limited owing to the mode instability effect.
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