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Two-dimensional diffractive coherent combining of 15 fiber amplifiers into a 600 W beam. 2012
Peter A Thielen, and
James G Ho, and
David A Burchman, and
Gregory D Goodno, and
Joshua E Rothenberg, and
Michael G Wickham, and
Angel Flores, and
Chunte A Lu, and
Benjamin Pulford, and
Craig Robin, and
Anthony D Sanchez, and
D Hult, and
K B Rowland
Northrop Grumman Aerospace Systems, Redondo Beach, California 90278, USA. peter.thielen@ngc.com
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.
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