Experimental study of SBS suppression and coherence property of 1064 nm high power multi-tone fiber amplifier |
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Authors: | Wenbo Du Xiaolin Wang Yanxing Ma Jiajian Zhu Xiaolin Dong Pu Zhou Xiaojun Xu Bohong Shu |
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Affiliation: | College of Opto-Electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China |
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Abstract: | Seeding high power fiber amplifier employing multi-tone fiber laser is an effective approach to suppress stimulated Brillouin scattering (SBS). In this paper, a two-stage 1064 nm high power fiber amplification system was set up. Single-, two- and three-tone fiber lasers were employed. SBS threshold powers and maximum output powers of the multi-tone cases are enhanced compared with the single-tone case. The multi-tone amplifiers also show comparable optical-to-optical efficiency to the single-tone amplifier. To demonstrate and validate coherence property of the two multi-tone fiber amplifiers, the output laser beams of the amplifiers were self-interfered in our self-made coherent beam combining system. The laser beams of the multi-tone cases showed good coherence property comparable to the single-tone case, which implied that the high power output laser light of the multi-tone fiber amplifiers could be used for coherent beam combining. |
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