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29 March 2019 Efficient phase-locking of a tiled fiber array of 37 fiber lasers using SPGD
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Proceedings Volume 11046, Fifth International Symposium on Laser Interaction with Matter; 1104632 (2019) https://doi.org/10.1117/12.2524459
Event: Fifth International Symposium on Laser Interaction with Matter, 2018, Changsha, China
Abstract
We present the laboratory experiments of phase locking of a 37-channel tiled fiber array using a stochastic parallel gradient descent (SPGD) feedback controller. The experimental setup comprises a hexagonally close-packed array of thirty-seven 23-mm-diameter fiber collimator sub-apertures. The fraction of the output laser power within a solid angle of 1.22λ/D was measured in open loop state and then in closed loop state. The results show that the power in the bucket was increased from 0.028 in open loop to 0.890 in closed loop. When the 37 beams were phase-locked, the residual phase error was λ/23. The power ratio in the bucket (PIB) was 28% that improved 32 times than the open loop state.
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Jiachao Xi, Hongxiang Chang, Rongtao Su, Yanxing Ma, and Lei Si "Efficient phase-locking of a tiled fiber array of 37 fiber lasers using SPGD", Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 1104632 (29 March 2019); https://doi.org/10.1117/12.2524459
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