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7 May 2012 Coherent coupling of spectrally broadband laser channels
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This paper discusses the experimental study and provides the analysis of an innovative approach to the passive-coherent combining of a spectrally-broadband laser channel array. Conventional coherent laser beam combining methods use a single-step technique based on phase-control of radiation in the combining channels with the goal of reducing the output beam to its diffraction limits. The novelty of our method is a two-stage approach in beam combining that enables (1) to couple multiple channels into a single beam with a stable mode structure, and (2) to convert this coupled beam in to a diffraction-limited state by using a stationary wavefront corrector. By using this method with the laser cavity in a stable configuration we effectively demonstrated our approach. This resulted in an efficient coupling of multiple channels by oscillating a single high-index Hermit-Gaussian mode. The cavity-based beam combining technique facilitates phase locking of multiple spectrally-broadband channels and therefore allows the suppression of nonlinear effects in individual fiber channels.
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Anatoliy Khizhnyak and Vladimir Markov "Coherent coupling of spectrally broadband laser channels", Proc. SPIE 8381, Laser Technology for Defense and Security VIII, 83810O (7 May 2012);


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