Dr. Constance Valentin Profile

Dr. Constance Valentin

at Ctr Lasers Intenses et Applications

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Author

Publications (12)

Proceedings Article | 8 June 2023 Presentation

Multiscale modeling of HHG and its applications

Jan Vábek, Ondřej Finke, Kevin Veyrinas, Constance Valentin, Tadeáš Němec, Dominique Descamps, Michal Nevrkla, Clément Péjot, Nadezhda Bobrova, Frédéric Burgy, Lucie Jurkovičová, Martin Albrecht, Alexandr Jančárek, Eric Constant, Ondřej Hort, Eric Mével, Jiří Limpouch, Stefan Skupin, Jaroslav Nejdl, Fabrice Catoire

Proceedings Volume PC12582, PC1258206 (2023) https://doi.org/10.1117/12.2665958

KEYWORDS: Numerical analysis, Kerr effect, Ionization

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Proceedings Article | 9 June 2017 Presentation

Latest developments on fibered MOPA in mJ range with hollow-core fiber beam delivery and fiber beam shaping used as seeder for large scale laser facilities (Conference Presentation)

Jean-François Gleyze, Florent Scol, Arnaud Perrin, Pierre Gouriou, Constance Valentin, Géraud Bouwmans, Emmanuel Hugonnot

Proceedings Volume 10238, 102380J (2017) https://doi.org/10.1117/12.2264577

KEYWORDS: Laser applications, Amplitude modulation, Fiber lasers, Beam shaping, Fiber amplifiers, Beam delivery, Fusion energy, Optical amplifiers, Frequency modulation, Plasma physics

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The Laser Megajoule (LMJ) is a French large scale laser facility dedicated to inertial fusion and plasma physics research. LMJ front-ends are based on fiber laser technology at nanojoule range [1]. Scaling the energy of those fiber seeders to the millijoule range is a way to upgrade LMJ’s front ends architecture and could also be used as seeder for lasers for ELI project for example. However, required performances are so restrictive (optical-signal-to-noise ratio higher than 50 dB, temporally-shaped nanosecond pulses and spatial single-mode top-hat beam output) that such fiber systems are very tricky to build. High-energy fiber amplifiers In 2015, we have demonstrated, an all-fiber MOPA prototype able to produce a millijoule seeder, but unfortunately not 100% conform for all LMJ’s performances. A major difficulty was to manage the frequency modulation used to avoid stimulated Brillouin scattering, to amplitude modulation (FM-AM) conversion, this limits the energy at 170µJ. For upgrading the energy to the millijoule range, it’s necessary to use an amplifier with a larger core fiber. However, this fiber must still be flexible; polarization maintaining and exhibit a strictly single-mode behaviour. We are thus developing a new amplifier architecture based on an Yb-doped tapered fiber: its core diameter is from a narrow input to a wide output (MFD 8 to 26 µm). A S² measurement on a 2,5m long tapered fiber rolled-up on 22 cm diameter confirmed that this original geometry allows obtaining strictly single-mode behaviour. In a 1 kHz repetition rate regime, we already obtain 750 µJ pulses, and we are on the way to mJ, respecting LMJ performances. Beam delivery In LMJ architecture the distance between the nanojoule fiber seeder and the amplifier stages is about 16 m. Beam delivery is achieved with a standard PM fiber, such a solution is no longer achievable with hundreds of kilowatt peak powers. An efficient way to minimize nonlinear effects is to use hollow-core (HC) fibers. The comparison between the different fibers will be presented in the conference. Fiber spatial beam shaping Spatial beam shaping (top-hat profile) is mandatory to optimize the energy extraction in free-space amplifier. It would be very interesting to obtain a flat-top beam in an all-fiber way. Accordingly, we have design and realize a large mode area single-mode top-hat fiber able to deliver a coherent top-hat beam. This fiber, with larger MFD adapted to mJ pulse, will be implemented to perform the spatial beam shaping from coherent Gaussian profile to coherent top-hat intensity profile in the mJ range. In conclusion, we will present an all-fiber MOPA built to fulfil stringent requirements for large scale laser facility seeding. We have already achieved 750 µJ with 10 ns square pulses. Transport of high peak power pulses over 17 m in a hollow-core fiber has been achieved and points out FM to AM conversion management issues. Moreover, spatial beam shaping is obtained by using specifically designed single-mode fibers. Various optimizations are currently under progress and will be presented.

Proceedings Article | 9 May 2017 Presentation

mJ range all-fiber MOPA prototype with hollow-core fiber beam delivery designed for large scale laser facilities seeding (Conference Presentation)

Florent Scol, Pierre Gouriou, Arnaud Perrin, Jean-François Gleyze, Constance Valentin, Géraud Bouwmans, Emmanuel Hugonnot

Proceedings Volume 10083, 1008304 (2017) https://doi.org/10.1117/12.2250321

KEYWORDS: Laser applications, Amplifiers, Gaussian beams, Beam shaping, Prototyping, Fiber lasers, Frequency modulation, Amplitude modulation, Fusion energy, Beam delivery

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Proceedings Article | 27 April 2016 Paper

First realization of a birefringent flat-top single-mode fiber

C. Valentin, P. Gouriou, F. Scol, B. Sevigny, Y. Quiquempois, L. Bigot, R. Habert, A. Cassez, O. Vanvincq, E. Hugonnot, G. Bouwmans

Proceedings Volume 9886, 988615 (2016) https://doi.org/10.1117/12.2227616

KEYWORDS: Polarization, Single mode fibers, Birefringence, Cladding, Refractive index, Near field, Fermium

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Proceedings Article | 11 March 2016 Paper

Top hat single-mode polarization maintaining fiber and polarizing numerical design

Pierre Gouriou, Florent Scol, Benoit Sevigny, Constance Valentin, Yves Quiquempois, Laurent Bigot, Rémi Habert, Andy Cassez, Olivier Vanvincq, Emmanuel Hugonnot, Geraud Bouwmans

Proceedings Volume 9728, 97281A (2016) https://doi.org/10.1117/12.2209521

KEYWORDS: Fiber lasers, Laser processing, Laser applications, Laser tissue interaction, Polarization, Birefringence, Fermium, Boron, Silica, Single mode fibers

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Proceedings Article | 12 May 2015 Paper

Industrial mJ-class all-fiber front end with spatially coherent top-hat beam output used as seeder for high power laser

Jean-François Gleyze, A. Perrin, Pierre Calvet, Pierre Gouriou, Florent Scol, Constance Valentin, Géraud Bouwmans, E. Lecren, Emmanuel Hugonnot

Proceedings Volume 9513, 95130C (2015) https://doi.org/10.1117/12.2178484

KEYWORDS: Optical amplifiers, Fiber amplifiers, Fiber lasers, High power lasers, Beam shaping, Fusion energy, High power fiber amplifiers, Laser applications, Polarization, Bragg cells

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Proceedings Article | 24 October 2012 Paper

Recent advances in the design of photonic bandgap and hybrid fibers: from LMA to HNL fibers

Yves Quiquempois, Assaad Baz, Olivier Vanvincq, Constance Valentin, Laurent Bigot, Géraud Bouwmans, Alexandre Kudlinski, Arnaud Mussot, Pierre Calvet, Emmanuel Hugonnot, Marc Douay

Proceedings Volume 8412, 84121S (2012) https://doi.org/10.1117/12.2001429

KEYWORDS: Optical fibers, Cladding, Refractive index, Resonators, Optical properties, Supercontinuum generation, Dispersion, Signal attenuation, Silica, Micro optical fluidics

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Proceedings Article | 11 May 2012 Paper

Top-hat beam output from a large mode area microstructured fiber for beam delivery

Pierre Calvet, Constance Valentin, Yves Quiquempois, Géraud Bouwmans, Laurent Bigot, Marc Douay, Arnaud Mussot, Emmanuel Hugonnot

Proceedings Volume 8433, 84330K (2012) https://doi.org/10.1117/12.921691

KEYWORDS: Beam delivery, Fiber lasers, Refractive index, Structured optical fibers, Beam shaping, Laser applications, Laser marking, Optical simulations, Near field, Optical design

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Proceedings Article | 26 April 2012 Paper

Flattened fundamental mode in microstructured fibers: design, realization and characterization

Constance Valentin, Yves Quiquempois, Géraud Bouwmans, Laurent Bigot, Marc Douay, Arnaud Mussot, Laure Lago, Pierre Calvet, Emmanuel Hugonnot

Proceedings Volume 8426, 84260J (2012) https://doi.org/10.1117/12.922244

KEYWORDS: Optical fibers, Fiber lasers, Silica, Near field, Beam shaping, Laser applications, Laser cutting, Optical simulations, Bandpass filters, Numerical simulations

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Proceedings Article | 18 May 2009 Paper

Response of molecular solids to ultra-intense femtosecond soft x-ray pulses

J. Chalupský, L. Juha, V. Hájková, J. Cihelka, L. Vysin, J. Gautier, J. Hajdu, S. Hau-Riege, M. Jurek, J. Krzywinski, Ri. London, E. Papalazarou, J. Pelka, G. Rey, S. Sebban, R. Sobierajski, N. Stojanovic, K. Tiedtke, S. Toleikis, T. Tschentscher, C. Valentin, H. Wabnitz, P. Zeitoun

Proceedings Volume 7361, 736108 (2009) https://doi.org/10.1117/12.822297

KEYWORDS: Polymethylmethacrylate, Laser ablation, X-rays, Solids, Atomic force microscopy, X-ray lasers, Chemical species, Signal attenuation, Gaussian beams, Surface roughness

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Proceedings Article | 20 September 2007 Paper

XUV optics for attosecond applications

J. Gautier, A. S. Morlens, P. Zeitoun, G. Rey, C. Valentin, E. Papalarazou, J. P. Goddet, S. Sebban, F. Delmotte, M. F. Ravet, F. Bridou

Proceedings Volume 6705, 67050C (2007) https://doi.org/10.1117/12.732424

KEYWORDS: Mirrors, Reflectivity, Holography, Holograms, Multilayers, Silicon, Extreme ultraviolet, Microscopy, Digital holography, X-rays

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Proceedings Article | 19 December 2003 Paper

New techniques for the measurement of x-ray beam or x-ray optics quality

Philippe Zeitoun, Philippe Balcou, Samuel Bucourt, Djamel Benredjem, Franck Delmotte, Guillaume Dovillaire, Denis Douillet, James Dunn, G. Faivre, Marta Fajardo, Kenneth Goldberg, Mourad Idir, Sebastien Hubert, Jim Hunter, Sylvie Jacquemot, Sophie Kazamias, Sebastien le Pape, Xavier Levecq, Ciaran Lewis, Remy Marmoret, Pascal Mercere, A. Morlens, Patrick Naulleau, Christian Remond, Jorge Rocca, Stephane Sebban, Raymond Smith, Marie-Francoise Ravet, Philippe Troussel, Constance Valentin, Laurent Vanbostal

Proceedings Volume 5197, (2003) https://doi.org/10.1117/12.508183

KEYWORDS: Wavefronts, X-ray lasers, Wavefront sensors, Extreme ultraviolet, Plasma, Mirrors, Interferometers, Picosecond phenomena, Michelson interferometers, X-ray optics

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