Dr. Louis Daniault Profile

Dr. Louis Daniault

Research Engineer at Ecole Polytechnique

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Publications (6)

Proceedings Article | 5 March 2021 Presentation + Paper

61 channels coherent beam combining femtosecond digital laser

Jean-Christophe Chanteloup, Séverine Bellanger, Louis Daniault, Ihsan Fsaifes, Matthieu Veinhard, Jérôme Bourderionnet, Christian Larat, Eric Lallier, Arnaud Brignon

Proceedings Volume 11665, 116651H (2021) https://doi.org/10.1117/12.2576606

KEYWORDS: Femtosecond phenomena, Prototyping, Beam shaping, Structured light, Near field, Composites, Beam controllers

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Proceedings Article | 21 February 2020 Paper

Coherent beam combining of 60 femtosecond fiber amplifiers

Ihsan Fsaifes, Louis Daniault, Séverine Bellanger, Matthieu Veinhard, Jérôme Bourderionnet, Christian Larat, Eric Lallier, Eric Durand, Arnaud Brignon, Jean-Christophe Chanteloup

Proceedings Volume 11260, 112600L (2020) https://doi.org/10.1117/12.2545229

KEYWORDS: Fiber amplifiers, Femtosecond phenomena, Phase measurement, Interferometry, Fiber lasers, Near field, Amplifiers, Laser systems engineering, Collimation, Microlens array

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Proceedings Article | 26 February 2018 Paper

Towards coherent combination of 61 fiber amplifiers

Anke Heilmann, Jérémy Le Dortz, Louis Daniault, Ihsan Fsaifes, Séverine Bellanger, Marie Antier, Jérôme Bourderionnet, Christian Larat, Eric Lallier, Eric Durand, Arnaud Brignon, Christophe Simon-Boisson, Jean-Christophe Chanteloup

Proceedings Volume 10512, 105120B (2018) https://doi.org/10.1117/12.2287862

KEYWORDS: Coherent beam combination, Fiber amplifiers, Amplifiers, Phase measurement, Fiber lasers, Femtosecond phenomena

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Proceedings Article | 14 December 2016 Presentation

XCAN project : coherent beam combining of large number fibers in femtosecond regime (Conference Presentation)

Marie Antier, Jeremy Le Dortz, Jerome Bourderionnet, Christian Larat, Eric Lallier, Louis Daniault, Ihsan Fsaifes, Anke Heilmann, Severine Bellanger, Christophe Simon-Boisson, Jean-Christophe Chanteloup, Arnaud Brignon

Proceedings Volume 9992, 99920B (2016) https://doi.org/10.1117/12.2240473

KEYWORDS: Optical fibers, Femtosecond phenomena, Fiber amplifiers, Mode locking, Phase measurement, Phase shifts, Laser development, Beam splitters, Oscillators, Optical amplifiers

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The XCAN project, which is a three years project and began in 2015, carried out by Thales and the Ecole Polytechnique aims at developing a laser system based on the coherent combination of laser beams produced through a network of amplifying optical fibers. This technique provides an attractive mean of reaching simultaneously the high peak and high average powers required for various industrial, scientific and defense applications. The architecture has to be compatible with very large number of fibers (1000-10000). The goal of XCAN is to overcome all the key scientific and technological barriers to the design and development of an experimental laser demonstrator. The coherent addition of multiple individual phased beams is aimed to provide tens of Gigawatt peak power at 50 kHz repetition rate. Coherent beam combining (CBC) of fiber amplifiers involves a master oscillator which is split into N fiber channels and then amplified through series of polarization maintaining fiber pre-amplifiers and amplifiers. In the so-called tiled aperture configuration, the N fibers are arranged in an array and collimated in the near field of the laser output. The N beamlets then interfere constructively in the far field, and give a bright central lobe. CBC techniques with active phase locking involve phase mismatch detection, calculation of the correction and phase compensation of each amplifier by means of phase modulators. Interferometric phase measurement has proven to be particularly well suited to phase-lock a very large number of fibers in continuous regime. A small fraction of the N beamlets is imaged onto a camera. The beamlets interfere separately with a reference beam. The phase mismatch of each beam is then calculated from the interferences’ position. In this presentation, we demonstrate the phase locking of 19 fibers in femtosecond pulse regime with this technique. In our first experiment, a master oscillator generates pulses of 300 fs (chirped at 200 ps). The beam is split into 19 passive channels. Prior to phase locking, the optical path differences are adjusted down to 10 μm with optical delay lines. Interferograms of the 19 fibers are recorded at 1 kHz with a camera. A dedicated algorithm is developed to measure both the phase and the delay between the fibers on a measurement path. The delay and phase shift are thus calculated collectively from a single image and piezo-electric fiber stretchers are controlled in order to ensure compensation of time-varying phase and delay variations. The residual phase shift error is below λ/60 rms. The coherent beam combining is obtained after propagation and compression. The combined pulse width is measured at 315fs. A second experiment was done to coherently combine two amplified channels of the XCAN demonstrator. A residual phase shift error of λ/30 rms was measured in this case.

Proceedings Article | 16 February 2012 Paper

Passive coherent beam combining of two femtosecond fiber chirped-pulse amplifiers

Louis Daniault, Marc Hanna, Dimitris Papadopoulos, Yoann Zaouter, Eric Mottay, Frédéric Druon, Patrick Georges

Proceedings Volume 8237, 823709 (2012) https://doi.org/10.1117/12.908417

KEYWORDS: Fiber amplifiers, Optical amplifiers, Femtosecond phenomena, Interferometers, Scanning probe microscopy, Sagnac interferometers, Beam splitters, Amplifiers, Oscillators, Optical isolators

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Proceedings Article | 14 May 2010 Paper

Amplification of femtosecond pulses in large mode area Bragg fibers

Dmitry Gaponov, Sébastien Février, Philippe Roy, Marc Hanna, Dimitris Papadopoulos, Frédéric Druon, Louis Daniault, Patrick Georges, Mikhail Likhachev, Mikhail Salganskii, Mikhail Yashkov

Proceedings Volume 7714, 771405 (2010) https://doi.org/10.1117/12.854581

KEYWORDS: Amplifiers, Femtosecond phenomena, Optical fibers, Fiber amplifiers, Picosecond phenomena, Waveguides, Polarization, Cladding, Refractive index, Photonic crystal fibers

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