title: Diffractive coherent combining of a 2.5 kW fiber laser array into a 1.9 kW Gaussian beam.
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.
authors: Massachusetts Institute of Technology, Lincoln Laboratory, 244 Wood Street, Lexington, Massachusetts 02420, USA. s.redmond@ll.mit.edu
authors: Shawn M
authors: SM
authors: Redmond
authors: Daniel J
authors: DJ
authors: Ripin
authors: Charles X
authors: CX
authors: Yu
authors: Steven J
authors: SJ
authors: Augst
authors: Tso Yee
authors: TY
authors: Fan
authors: Peter A
authors: PA
authors: Thielen
authors: Joshua E
authors: JE
authors: Rothenberg
authors: Gregory D
authors: GD
authors: Goodno