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2 September 2016 Multi-kilowatt diffractive coherent combining of pseudorandom-modulated fiber amplifiers
Angel Flores, Iyad Dajani, Roger H. Holten, Thomas Ehrenreich, Brian T. Anderson
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Optical Engineering, Vol. 55, Issue 9, 096101 (September 2016). https://doi.org/10.1117/1.OE.55.9.096101
Abstract
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 (M2<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 coherently combined via the DOE. Notably, a total output power of ∼5  kW was achieved with 82% combining efficiency and excellent beam quality (M2<1.1). The intrinsic DOE splitter loss was 5%. Additional losses due in part to nonideal polarization, amplified spontaneous emission content, uncorrelated wavefront errors, and fractional beam misalignments contributed to the efficiency reduction. Overall, multi-kW beam combining of pseudorandom-modulated fiber amplifiers was demonstrated for the first time.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Angel Flores, Iyad Dajani, Roger H. Holten, Thomas Ehrenreich, and Brian T. Anderson "Multi-kilowatt diffractive coherent combining of pseudorandom-modulated fiber amplifiers," Optical Engineering 55(9), 096101 (2 September 2016). https://doi.org/10.1117/1.OE.55.9.096101
Published: 2 September 2016
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Cited by 35 scholarly publications and 3 patents.
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KEYWORDS
Fiber amplifiers
Diffractive optical elements
Optical amplifiers
Polarization
Beam splitters
High power fiber amplifiers
Modulation
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