Coherent Beam Combining Of A Nine-Fiber Laser Array Using An All-Optical Ring Cavity Feedback Loop Based On Diffractive Optical Element
OPTICAL ENGINEERING(2020)
摘要
Our study describes the development of coherent beam combining of an array of nine fiber lasers using an all-optical ring cavity feedback loop based on a diffractive optical element to achieve a single-aperture output. Nine 300-mW Yb-doped fiber amplifier beams arranged in a 1 x 9 end-cap array were combined to achieve a single-aperture beam with a power of 739 mW and a beam quality (M-2) of 1.18 with 21.5% combining efficiency. The optical spectra, far-field distributions, and time-domain characteristics of the combined beams were investigated under open- and closed-loop conditions. Under open-loop conditions, the far-field coherent visibility changed constantly from 72.1% to 90.9% and the fluctuation intensity was strong. Under closed-loop conditions, the system achieved a steady state with a visibility of 98.6% and an average feedback intensity of 0.4 V, indicating the occurrence of phase locking. Furthermore, mode hopping was observed when there were more than four channels in a combination. However, the system interference pattern remained stable. Comprehensive research on the relevant literature indicated that novel filled-aperture CBC was achieved using an all-optical ring cavity feedback loop based on a DOE. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)
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关键词
fiber lasers, coherent beam combining, phase locking, diffractive optical element
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