On-Demand Phase Control of a 7-Fiber Amplifiers Array with Neural Network and Quasi-Reinforcement Learning

Autor: Maksym Shpakovych, Geoffrey Maulion, Alexandre Boju, Paul Armand, Alain Barthélémy, Agnès Desfarges-Berthelemot, Vincent Kermene

Publikováno v: Photonics, Vol 9, Iss 4, p 243 (2022)

We report a coherent beam combining technique using a specific quasi-reinforcement learning scheme. A neural network learned by this method enables the tailoring and locking of a tiled beam array on any phase map. We present the experimental implemen

Externí odkaz: https://doaj.org/article/edfee900a85f4ed081234bd575fad510

Bragg-Scattering Four-Wave Mixing in Nonlinear Fibers with Intracavity Frequency-Shifted Laser Pumps

Autor: Katarzyna Krupa, Michela Bettenzana, Alessandro Tonello, Vincent Couderc, Philippe Di Bin, Stefan Wabnitz, Alain Barthélémy

Publikováno v: International Journal of Optics, Vol 2012 (2012)

We experimentally study four-wave mixing in highly nonlinear fibers using two independent and partially coherent laser pumps and a third coherent signal. We focus our attention on the Bragg-scattering frequency conversion. The two pumps were obtained

Externí odkaz: https://doaj.org/article/376db897633c41d584a789d392f98e40

Small footprint phase locking system for a large tiled aperture laser array

Autor: J Ledortz, Jeremy Saucourt, Paul Armand, A Boju, A Koudoro, M Naiim-Habib, Vincent Kermène, J Leval, Alain Barthélémy, J-M Berthomier, Agnès Desfarges-Berthelemot, Geoffrey Maulion

Publikováno v: Optics express. 29(8)

A phase sensing system fitted to the control of coherent laser beam array of large cross section is experimented. It is based on the use of a fiber bundle that collects a weak part of the synthetic wavefront, that scales it down (1/40) and that resha

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fa382e3238cdd4246fedc780f47c22b
https://pubmed.ncbi.nlm.nih.gov/33984923

Determining the Rashba parameter from the bilinear magnetoresistance response in a two-dimensional electron gas

Autor: Diogo C. Vaz, Manuel Bibes, Alain Barthélémy, A. Fert, Karin Garcia, Józef Barnaś, Felix Trier, Ingrid Mertig, Annika Johansson, A. Dyrdał

Publikováno v: Physical Review Materials
Physical Review Materials, American Physical Society, 2020, 4 (7), ⟨10.1103/PhysRevMaterials.4.071001⟩
Phys. Rev. Mater. 4, 071001(R) (2020)

Two-dimensional (2D) Rashba systems have been intensively studied in the last decade due to their unconventional physics, tunability capabilities, and potential for spin-charge interconversion when compared to conventional heavy metals. With the adve

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df40d5122c3a2ee0abb70c98b1919936
https://doi.org/10.1103/physrevmaterials.4.071001

Random scattering and alternating projection optimization for active phase control of a laser beam array

Autor: Jeremy Saucourt, Alain Barthélémy, Agnès Desfarges-Berthelemot, Vincent Kermène, Paul Armand

Publikováno v: IEEE Photonics Journal, Vol 11, Iss 4, Pp 1-9 (2019)
IEEE Photonics Journal
IEEE Photonics Journal, Institute of Electrical and Electronics Engineers (IEEE), 2019, 11 (4), pp.1-9. ⟨10.1109/JPHOT.2019.2926859⟩

International audience; A fraction of a laser beam array, whose unknown piston phase relationships must be set to prescribed values, is launched into a scattering media with random transmission. The resulting output speckle pattern is sampled by an a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eef68afa0d7aa78bef5edb2b0aae37a3
http://arxiv.org/abs/1903.02780