1. Coherent beam combining of a narrow-linewidth long-pulse Er^3+-doped multicore fiber amplifier
- Author
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L. Ramirez, Laurent Lombard, Géraud Bouwmans, Marc Hanna, Laurent Bigot, Florian Prévost, J. Primot, Laboratoire Charles Fabry (LCF), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), Photonique (Photonique), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université de Lille, ONERA - The French Aerospace Lab [Palaiseau], ONERA-Université Paris Saclay (COmUE), Laboratoire Charles Fabry / Lasers, Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur les Composants logiciels et matériels pour l'Information et la Communication Avancé - USR 3380 (IRCICA), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), ONERA, Université Paris Saclay [Palaiseau], ONERA-Université Paris-Saclay, Physique des atomes, lasers, molécules et surfaces (PALMS), Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), and Photonique [Photonique]
- Subjects
Materials science ,(140.3500) Lasers ,Phase (waves) ,chemistry.chemical_element ,02 engineering and technology ,01 natural sciences ,OCIS codes: (140.3298) Laser beam combining ,law.invention ,010309 optics ,Erbium ,Laser linewidth ,020210 optoelectronics & photonics ,Optics ,LASERS ,law ,(060.2320) Fiber optics amplifiers and oscillators ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Optical amplifier ,LASERS PULSED ,Spatial light modulator ,business.industry ,FIBRE MULTIMODE ,Amplifier ,(140.3538) Lasers ,FIBER OPTICS AMPLIFIERS AND OSCILLATORS ,Laser ,pulsed ,Atomic and Molecular Physics, and Optics ,LASER BEAM COMBINING ,erbium ,chemistry ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,COMBINAISON COHÉRENTE ,business ,[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing ,Beam (structure) - Abstract
International audience; 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.
- Published
- 2017