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Two-dimensional diffractive coherent combining of 15 fiber amplifiers into a 600 W beam

Peter A. Thielen, James G. Ho, David A. Burchman, Gregory D. Goodno, Joshua E. Rothenberg, Michael G. Wickham, Angel Flores, Chunte A. Lu, Benjamin Pulford, Craig Robin, Anthony D. Sanchez, D. Hult, and K. B. Rowland

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Abstract

We demonstrate coherent beam combining using a two-dimensionally patterned diffractive optic combining element. Fifteen Yb-doped fiber amplifier beams arranged in a 3×5 array were combined into a single 600 W, M2=1.1 output beam with 68% combining efficiency. Combining losses under thermally stable conditions at 485 W were found to be dominated by spatial mode-mismatch between the free space input beams, in quantitative agreement with calculations using the measured amplitude and phase profiles of the input beams.

© 2012 Optical Society of America

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