F. Réau

Laboratoire Interactions, Dynamiques et Lasers

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P. D’Oliveira

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

P. Monot

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

T. Ceccotti

Université Paris-Saclay

O. Tcherbakoff

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Ph. Martin

Université Joseph Fourier

S. Dobosz

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Jean-François Hergott

Université Paris-Saclay

Horia Popescu

Synchrotron soleil

Rodrigo López-Martens

Centre National de la Recherche Scientifique

F. Quéré

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Cooperative Institutions

Centre National de la Recherche Scientifique

117

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

113

Université Paris-Saclay

CEA Paris-Saclay

École Polytechnique

Laboratoire Interactions, Dynamiques et Lasers

Institut Rayonnement-Matière de Saclay

Sorbonne Université

CEA Paris-Saclay - Etablissement de Saclay

Centre Lasers Intenses et Applications

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Experimental and numerical demonstration of driver pulse spectral width and phase dependence in near-single-cycle pulse post-compression generation

Optics Continuum (2023)

Jean-François Hergott F. Réau F. Lepetit O. Tcherbakoff O. Sublemontier

For many years, light-matter interaction in the strong-field regime has benefited from continuous improvement of femtosecond lasers, in terms of peak power or repetition rate. One of the most current major challenges is the achievement of high-energy, near single-cycle pulses. Such performances are of primary interest in attosecond science for producing intense isolated bursts of extreme ultraviolet light through high-harmonic generation in gases or solids. We present here a detailed experimental and numerical study on a helium filled hollow-core fiber-based post-compression stage. Our measurements highlight the importance of the width and phase of the input spectrum on the spectral broadening, and on the resulting post-compressed pulse. Near Fourier-transform-limited pulses as short as 3.5 fs, carrying a 2.5 mJ energy centered at 750 nm at 1 kHz repetition rate, and leading to a compression factor greater than seven, are demonstrated. The numerical results are in good agreement with the experimental data. Here, spectral broadening is governed by the Kerr effect and the self-steepening on the trailing edge of the guided pulse.

Extreme ultraviolet

Pulse compression

10.1364/optcon.492963

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Citations (1)

Results of a laser-driven electron acceleration experiment and perspectives of application for nuclear studies

Radiation effects and defects in solids (2010)

Andrea Gamucci Nicolas Bourgeois T. Ceccotti X. Davoine S. Dobosz

High-energy electrons can be produced in interactions of intense, ultra-short laser pulses with plasmas. Experiments conducted in the regime of moderate laser power (a few terawatts [TW]) are attracting increasing attention for their possibility of optimizing the acceleration process. Here we report the successful production of several-MeV electron bunches in interactions of femtosecond laser pulses from a 10 TW tabletop laser with supersonic gas-jets. The laser–plasma interaction and the obtained electron bunches have been characterized in detail, and conditions for stable and reproducible acceleration have been found. The accelerated electron bunches have been characterized by means of the measurement of the induced photo-activation of a gold sample via bremsstrahlung-generation of photons with suitable energy. The obtained result opens up a wide range of possible applications of the compact electron source for the concerns of nuclear physics studies. Some of them are briefly considered in this paper.

Bunches

Plasma acceleration

10.1080/10420151003731983

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Plasma mirrors for ultrahigh-intensity optics

Nature Physics (2007)

C. Thaury F. Quéré J. P. Geindre A. Lévy T. Ceccotti

Attosecond

Reflection

10.1038/nphys595

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Citations (472)

Proton Acceleration with High-Intensity Ultrahigh-Contrast Laser Pulses

Physical Review Letters (2007)

T. Ceccotti A. Lévy Horia Popescu F. Réau P. D’Oliveira

We report on simultaneous measurements of backward- and forward-accelerated protons spectra when an ultrahigh intensity (approximately 5 x 10(18) W/cm(20), ultrahigh contrast (>10(10)) laser pulse interacts with foils of thickness ranging from 0.08 to 105 microm. Under such conditions, free of preplasma originating from ionization of the laser-irradiated surface, we show that the maximum proton energies are proportional to the p component of the laser electric field only and not to the ponderomotive force and that the characteristics of the proton beams originating from both target sides are almost identical. All these points have been corroborated by extensive 1D and 2D particle-in-cell simulations showing a very good agreement with the experimental data.

Intensity

Ponderomotive force

10.1103/physrevlett.99.185002

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Citations (222)

Cross-polarized wave generation in multi-pass cells

Optica High-brightness Sources and Light-driven Interactions Congress 2022 (2022)

Jaismeen Kaur Louis Daniault Zhao Cheng Jean-François Hergott F. Réau

We report on cross-polarised wave generation in multi-pass cells at the milli-Joule level. Backed by simulations, results indicate 10 3 contrast enhancement, high spatio-temporal beam quality, and a record internal conversion efficiency of 50%.

Joule (programming language)

10.1364/euvxray.2022.jth6a.2

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Isochoric heating and strong blast wave formation driven by fast electrons in solid-density targets

New Journal of Physics (2017)

J. J. Santos B. Vauzour M. Touati L. Grémillet J-L Feugeas

We experimentally investigate the fast () isochoric heating of multi-layer metallic foils and subsequent high-pressure hydrodynamics induced by energetic electrons driven by high-intensity, high-contrast laser pulses. The early-time temperature profile inside the target is measured from the streaked optical pyrometry of the target rear side. This is further characterized from benchmarked simulations of the laser-target interaction and the fast electron transport. Despite a modest laser energy (), the early-time high pressures and associated gradients launch inwards a strong compression wave developing over ps into a blast wave, according to hydrodynamic simulations, consistent with our measurements. These experimental and numerical findings pave the way to a short-pulse-laser-based platform dedicated to high-energy-density physics studies.

Isochoric process

Blast wave

10.1088/1367-2630/aa806b

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Citations (17)

<title>Plasma diagnostics using high-order-harmonics generation</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2006)

Ph. Martin Gilles Doumy Marina Servol M. Bougeard H. Stabile

By focusing an intense femtosecond, high temporal contrast, laser on ultra-thin foils (100 nm) in the 10¹⁸W/cm² intensities range, we demonstrate that we create instantaneously a hot solid-density plasma. The use of highorder harmonics generated in a gas jet, providing a probe beam of sufficiently short wavelengths to penetrate in such media, enables to study the dynamics of this plasma on the picosecond time-scale. The comparison of the transmission of two successive harmonics permits to determine the electronic density and the temperature with an accuracy better than 15% never achieved up to date in relativistic regimes.

Picosecond

10.1117/12.675472

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Spatio-temporal pulse cleaning in multi-pass cells

arXiv (Cornell University) (2023)

Jaismeen Kaur Louis Daniault Zhao Cheng Oscar Tourneur O. Tcherbakoff

We study both numerically and experimentally the use of two third-order nonlinear temporal filtering techniques, namely nonlinear ellipse rotation (NER) and cross-polarized wave (XPW) generation, for spatio-temporal cleaning of mJ energy 30 fs Titanium:Sapphire laser pulses in a multi-pass cell. In both cases, a contrast enhancement greater than 3 orders of magnitude is observed, together with excellent output pulse quality and record high conversion efficiencies. Careful balancing of nonlinearity and dispersion inside the multi-pass cell helps tune the spectral broadening process and control the post-compressed pulse duration for specific applications.

Pulse duration

Ellipse

10.48550/arxiv.2302.14222

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Double plasma mirror for ultrahigh temporal contrast ultraintense laser pulses

Optics Letters (2007)

A. Lévy T. Ceccotti P. D’Oliveira F. Réau Michel Perdrix

We present and characterize a very efficient optical device that employs the plasma mirror technique to increase the contrast of high-power laser systems. Contrast improvements higher than 10(4) with 50% transmission are shown to be routinely achieved on a typical 10 TW laser system when the pulse is reflected on two consecutive plasma mirrors. Used at the end of the laser system, this double plasma mirror preserves the spatial profile of the initial beam, is unaffected by shot-to-shot fluctuations, and is suitable for most high peak power laser systems. We use the generation of high-order harmonics as an effective test for the contrast improvement produced by the double plasma mirrors.

Contrast ratio

10.1364/ol.32.000310

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Citations (168)

Influence of the pedestal on the interaction of a high-intensity, ultrashort laser pulse with a gas target

Journal of the Optical Society of America B (2002)

P. D’Oliveira S. Dobosz Sébastien Hulin P. Monot F. Réau

We report a study on the influence of the pedestal in laser–gas jet interaction experiments at very high intensity. The dynamic of the plasma resulting from the interaction is probed on a 3.8-ns time scale with a 60-fs time and a 5-µm space resolution using a Mach–Zehnder interferometer. It is observed that a plasma is created by the amplified spontaneous emission pedestal before the ultrashort pulse reaches the jet. We show that this preplasma modifies dramatically the propagation of the laser beam, which splits into two parts when it reaches the preplasma. The major part of the beam is strongly refracted by the preplasma while a small fraction is guided in the channel resulting from the hydrodynamic expansion of the preplasma.

Pedestal

Ultrashort pulse laser

10.1364/josab.19.002603

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Citations (7)