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Multi-kilowatt diffractive coherent combining of pseudorandom-modulated fiber amplifiers
2016
Optical Engineering: The Journal of SPIE
We report efficient coherent beam combining of five kW-class fiber amplifiers seeded with pseudorandom phase-modulated light, using a 1 × 5 diffractive optical element (DOE). Each fiber amplifier channel was path length matched, actively polarized, and provided approximately 1.2 kW of near diffraction-limited output power (M 2 < 1.1). A low-power sample of the combined beam after the DOE provided an error signal for active phase stabilization. After phase stabilization, the beams were
doi:10.1117/1.oe.55.9.096101
fatcat:pqkflaspdrfwvlt7hnsl72l7zy