Coherent beam combining of a narrow-linewidth long-pulse Er^3+-doped multicore fiber amplifier

Abstract : Active phase locking of a multicore erbium-doped fiber amplifier is demonstrated for 180 ns narrow-linewidth pulses at 1545 nm. A spatial light modulator is used at the input of the amplifier to control the optical phase of 7 beams injected in the hexagonally-arranged cores, ensuring efficient combining through a SPGD algorithm. At the output, combining is performed using a diffractive optical element. This experiment establishes multicore amplifiers as a promising way to scale the energy of Brillouin-limited pulsed amplifiers for LIDAR applications. We also present a simple lensless technique to measure phase shifts between pairs of adjacent channels that could be implemented in future active coherent combining systems.
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Article dans une revue
Optics Express, Optical Society of America, 2017, 25 (9), pp.9528-9534. 〈10.1364/OE.25.009528〉
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Dernière modification le : vendredi 30 mars 2018 - 11:14:02
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DOTA17064.1486143622.pdf
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F. Prevost, L. Lombard, J. Primot, Patricia Ramirez, L. Bigot, et al.. Coherent beam combining of a narrow-linewidth long-pulse Er^3+-doped multicore fiber amplifier. Optics Express, Optical Society of America, 2017, 25 (9), pp.9528-9534. 〈10.1364/OE.25.009528〉. 〈hal-01712236〉

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