Abstract

We present a direct-liquid-cooling fiber-coiling mode control technology to flexibly and effectively control the output beam quality of high-power fiber lasers. For theoretical guidelines, we propose a theoretical model of the fiber-coiling mode control method based on the bend loss estimated using the beam propagation method. The model is used to analyze the effects of fiber-coiling methods and fiber laser parameters on fiber-coiling mode control. Based on a theoretical analysis, we constructed two master oscillator power amplifiers with 20/400 and 25/400 fibers, respectively, to carry out experiments. The results demonstrate the accuracy of the theoretical model and the effectiveness of the direct-liquid-cooling fiber-coiling method in controlling the output beam quality.

© 2019 Optical Society of America

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