Coherent beam combining of pulsed fiber lasers with hybrid phase control |
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Authors: | X L Wang P Zhou Y X Ma H T Ma X J Xu Z J Liu and Y J Zhao |
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Institution: | (1) XLIM Research Institute, University of Limoges, 123 Av. Albert Thomas, 87060 Limoges, France; |
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Abstract: | We demonstrate a scalable architecture for coherent combining of all-fiber pulsed lasers with hybrid phase control involving
passive phasing and active phasing for the first time. Synchronized and passive phased pulsed laser array is built by intra-activity
phase modulation. Active phase control on the passive phased pulsed laser array using stochastic parallel gradient descent
algorithm provides stable in-phase coherent beam combining pattern in a turbulent atmosphere. The fringe visibility is increased
from 0 two 0.43 and the power encircled in the main-lobe is 1.616 times increased when the system evolves from passive phasing
to hybrid phasing. The architecture can be easily scaled up to high power by increasing power of each individual laser, number
of laser elements and introduction of power amplifiers, which will lead a promising way for scaleable high power coherent
beam combining of pulsed lasers. |
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Keywords: | |
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