Coherent beam combination of 1.08 kW fiber amplifier array using single frequency dithering technique |
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Authors: | Ma Yanxing Wang Xiaolin Leng Jinyong Xiao Hu Dong Xiaolin Zhu Jiajian Du Wenbo Zhou Pu Xu Xiaojun Si Lei Liu Zejin Zhao Yijun |
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Institution: | College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha, China. |
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Abstract: | Coherent beam combination of a 1.08?kW fiber amplifier array has been demonstrated for the first time, to our knowledge. In the experiment, nine fiber amplifiers are tiled into a 3×3 array, and the output power of each amplifier is approximately 120?W. A single frequency dithering algorithm is used to compensate the phase noises between the elements, which runs on a signal processor based on field programmable gate array for phase control on the fiber amplifiers. When the phase control system goes into closed loop, the fringe contrast of the far-field intensity pattern is improved to more than 85%, and the residual phase error is less than λ/15. |
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