Long-exposure far-field properties of the array of mutually-injected fiber lasers |
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Authors: | Jianqiu Cao Qisheng Lu Xiaojun Xu |
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Affiliation: | College of Opto-Electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, 410073, PR China |
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Abstract: | In this paper, the long-exposure far-field properties of the array of mutually-injected fiber lasers are studied to understand the effect of the multiple phase-locked states on coherent beam combining of the array. It is found that the long-exposure far-field will degenerate into the superposition of the intensities of the elementary lasers when all the phase-locked states of the array are exported with the same probability. It means that the interference pattern will be greatly weakened in the long-exposure far-field because of the export of multiple phase-locked states of the array. This result implies that the multiple phase-locked states of the array go against coherent beam combining of the array, and only some of these phase-locked states should be exported. Then, the effects of the high-order phase-locked states on the far-field are discussed. The result suggests that only the in-phase state should be exported (i.e., all the other phase-locked states should be suppressed) in order to realize high-efficiency (> 80%) coherent beam combining when the number of the elementary lasers of the array is smaller than 19. |
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Keywords: | Laser array Fiber lasers Coherent beam combining Phase locking |
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