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Opt Lett. 2009 Oct 1;34(19):2939-41. doi: 10.1364/OL.34.002939.

Coherent beam combination of three two-tone fiber amplifiers using stochastic parallel gradient descent algorithm.

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  • 1College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China.

Abstract

Multitone radiation is a promising technique to mitigate stimulated Brillouin scattering effects in narrow-linewidth fiber amplifiers. We demonstrate coherent beam combination of three two-tone fiber amplifiers using a stochastic parallel gradient descent (SPGD) algorithm. Phase control on the fiber amplifiers are performed by running the SPGD algorithm on a digital signal processor. The contrast of far-field intensity pattern of a coherently combined beam is more than 85%. Experimental results validate that a single-frequency seed laser is not indispensable for coherent beam combination in master oscillator power amplifier configuration.

PMID:
19794774
[PubMed]
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