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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
Diffractive coherent combining of a 2.5 kW fiber laser array into a 1.9 kW Gaussian beam
Shawn M Redmond1, Daniel J Ripin, Charles X Yu
1Massachusetts Institute of Technology, Lincoln Laboratory, 244 Wood Street, Lexington, Massachusetts 02420, USA. s.redmond@ll.mit.edu
Optics Letters
|July 25, 2012
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.
