Diffractive coherent combining of a 2.5 kW fiber laser array into a 1.9 kW Gaussian beam |
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| Authors: | Shawn M Redmond Daniel J Ripin Charles X Yu Steven J Augst Tso Yee Fan Peter A Thielen Joshua E Rothenberg Gregory D Goodno |
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| Institution: | Massachusetts Institute of Technology, Lincoln Laboratory, 244 Wood Street, Lexington, Massachusetts 02420, USA. s.redmond@ll.mit.edu |
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| Abstract: | Five 500 W fiber amplifiers were coherently combined using a diffractive optical element combiner, generating a 1.93 kW beam whose M(2)=1.1 beam quality exceeded that of the inputs. Combining efficiency near 90% at low powers degraded to 79% at full power owing to thermal expansion of the fiber tip array. |
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