Coherent Beam Combination of Three Fiber Amplifiers with Multi-dithering Technique

College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073

Received Date: July 20, 2008

Published Date: March 31, 2009

Abstract

Coherent beam combination of three W-level fiber amplifiers with multi-dithering technique is demonstrated. The multi-dithering technique is used for phase control in two channels. In the experiment, two channels are modulated by sine wave with 70kHz and 100kHz respectively, and two regular commercial DSP lock-in amplifiers and an industrial computer are used for electric signal processing in the feedback loop. The fringe contrast is advanced from 12% to 81%, and 78% coherent combination efficiency is obtained when the feedback loop is closed.

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