A5079342778- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Laser-Plasma Interactions and Diagnostics
- Advanced X-ray Imaging Techniques
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Laser Design and Applications
- Advanced Electron Microscopy Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Spectroscopy and Quantum Chemical Studies
- Laser Material Processing Techniques
- Solid State Laser Technologies
- Plasmonic and Surface Plasmon Research
- Ion-surface interactions and analysis
- Photorefractive and Nonlinear Optics
- Advanced Chemical Physics Studies
- Photonic Crystal and Fiber Optics
- Digital Holography and Microscopy
- Particle accelerators and beam dynamics
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- High-pressure geophysics and materials
- X-ray Spectroscopy and Fluorescence Analysis
- Crystallography and Radiation Phenomena
Centre National de la Recherche Scientifique
2001-2025
École Polytechnique
1994-2025
École Nationale Supérieure de Techniques Avancées
2022-2025
ParisTech
2024-2025
Laboratoire d'Optique Appliquée
2022-2025
Université Paris Cité
2025
Laboratoire Interactions, Dynamiques et Lasers
2011-2023
Université Paris-Saclay
2011-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2011-2022
CEA Paris-Saclay
2011-2022
Subfemtosecond light pulses can be obtained by superposing several high harmonics of an intense laser pulse. Provided that the are emitted simultaneously, increasing their number should result in shorter pulses. However, we found were not synchronized on attosecond time scale, thus setting a lower limit to achievable x-ray pulse duration. We showed synchronization could improved considerably controlling underlying ultrafast electron dynamics, provide 130 attoseconds discuss possibility...
We study high-order harmonic generation at a high pumping energy using long focal length lens. identify different saturation regimes of the emission, revealing interplay between phase matching, absorption, and laser defocusing. In optimal conditions, conversion efficiencies are obtained, resulting in an increase least one order magnitude energies compared to previously reported values. xenon, microjoule reached, opening new perspectives for applications this ultrashort coherent radiation.
Coherent x-ray diffractive imaging is a powerful method for studies on nonperiodic structures the nanoscale. Access to femtosecond dynamics in major physical, chemical, and biological processes requires single-shot diffraction data. Up now, this has been limited intense coherent pulses from free electron laser. Here we show that laser-driven ultrashort sources offer comparatively inexpensive alternative. We present measurements of patterns isolated nano-objects with single 20 fs pulse...
The first time-resolved x-ray/optical pump-probe experiments at the SLAC Linac Coherent Light Source (LCLS) used a combination of feedback methods and post-analysis binning techniques to synchronize an ultrafast optical laser linac-based x-ray laser. Transient molecular nitrogen alignment revival features were resolved in time-dependent x-ray-induced fragmentation spectra. These find temporal overlap pump probe pulses. strong-field dissociation generated quasi-bound dications was establish...
The Linac Coherent Light Source free electron laser is a source of high brightness x rays, 2×1011 photons in ∼5 fs pulse, that can be focused to produce double core vacancies through rapid sequential ionization. This enables vacancy Auger spectroscopy, an entirely new way study femtosecond chemical dynamics with electrons probe the local valence structure molecules near specific atomic core. Using 1.1 keV for x-ray ionization impulsively aligned molecular nitrogen, we observed rich...
Generation of attosecond x-ray pulses is attracting much attention within the free-electron laser (FEL) user community. Several schemes using extremely short to manipulate electron bunches have been proposed. In this paper, we extend two-color enhanced self-amplified spontaneous emission scheme proposed by Zholents et al. long optical cycle regime a second detuned and tapered undulator. Both lasers can be about ten cycles long, with frequency adjustable set optimize contrast between central...
In the context of x-ray lensless imaging, we present a recent approach for Fourier transform holography based on use extended references. Major advances shown here rely high signal efficiency and direct image reconstruction object performed by simple linear derivative. Moreover, holographic reference is easy to manufacture can be applied variety imaging experiments. Here demonstrate single-shot with table-top, laser-based coherent soft source. A spatial resolution 110 nm was obtained an...
We present a supercritical radiative shock experiment performed with the LULI nanosecond laser facility. Using targets filled xenon gas at low pressure, propagation of strong precursor is evidenced. The main measured quantities (electronic density and velocity) are shown to be in good agreement theory numerical simulations.
Calculations are presented for the generation of an isolated attosecond pulse in a multicycle two-color strong-field regime. We show that recollision electron wave packet can be confined to half optical cycle using pulses up 40 fs duration. The scheme is proven efficient two intense beams, one producing strong field at omega and other detuned from 2omega. slight detuning deltaomega second harmonic used break symmetry electric over many cycles provides coherent control formation pulse.
Abstract The enhancement and control of non-linear phenomena at a nanometer scale has wide range applications in science industry. Among these phenomena, high-harmonic generation solids is recent focus research to realize next petahertz optoelectronic devices or compact all solid state EUV sources. Here, we report on the realization first nanoscale high harmonic source. strong field regime reached by confining electric from few nanojoules femtosecond laser single 3D semiconductor waveguide....
On the basis of real-time ab initio calculations, we study non-perturbative interaction two-color laser pulses with MgO crystal in strong field regime to generate isolated attosecond pulse from high-harmonic emissions crystal. In this regard, examine impact incident characteristics such as its shape, intensity, and ellipticity well consequence anisotropy on emitted harmonics their corresponding pulses. Our calculations predict creation a duration ~ 300 attoseconds; addition, using elliptical...
High-order harmonic generation (HHG) from crystals is emerging as a new ultrashort source of coherent extreme ultraviolet (XUV) light. Doping the crystal structure can offer way to control properties. Here, we present study HHG enhancement in XUV spectral region an ionic crystal, using dopant-induced vacancy defects, driven by laser centered at wavelength 1.55 μm. Our numerical simulations based on solutions semiconductor Bloch equations and density-functional theory are supported our...
High-harmonic generation is a light up-conversion process occurring in strong laser field, leading to coherent bursts of extreme ultrashort broadband radiation [Lewenstein , Phys. Rev. A 2117 (1994)]. As new perspective, we propose that ultrafast strong-field electronic or photonic processes such as high-harmonic can potentially generate nonclassical states well before the decoherence system occurs [Gorlach Nat. Commun. 4598 (2020); Stammer ., Lett. 123603 (2022)]. This could address...
Incoherent Diffraction Imaging - IDI is a diffraction-based imaging technique that has been recently proposed to exploit the partial coherence of incoherently scattered light retrieve structural information from scattering centers. Similar stellar intensity interferometry Hanbury Brown and Twiss, signal builds up on second-order spatial correlations emitted light. The complex distribution target thereby encoded in fluctuations first experimental realisations this have realised using...
High-order harmonic generation (HHG) in semiconductor thin films from ultrashort mid-infrared laser drivers holds the potential for realization of integrated sources extreme ultraviolet light. Here, we demonstrate solid-state HHG zinc oxide synthesized by radiofrequency reactive magnetron sputtering process directly on cleaved facets optical fibers. Harmonics 3 to 13 radiation a fiber-based system delivering 500 kW, 96 fs pulses at 3130 nm are produced film and guided along fiber. A proper...
We demonstrate high-harmonic generation (HHG) in solids using a high-energy fiber laser system operating at 1550 nm. The driving few-cycle source consists of an erbium-doped chirped pulse amplifier combined with post-compression stage featuring gas-filled hollow-core photonic crystal (HC-PCF). nonlinear self-compression process the HC-PCF enables ultrashort pulses sub-50 fs durations and μJ-level energies 660 kHz repetition rate. Perturbative non-perturbative harmonics were subsequently...
We demonstrate that high-order harmonics generated by short, intense laser pulses in gases provide an interesting radiation source for extreme ultraviolet interferometry, since they are tunable, coherent, of short pulse duration, and simple to manipulate. Harmonics from the 9th 15th used measure thickness aluminum layer. The 11th harmonic is determine spatial distribution electron density a plasma produced 300-ps laser. Electronic densities higher than 2-10(20)electrons/cm>(3) measured.
The generation of attosecond pulses by superposition high harmonics relies on their synchronization in the emission. Our experiments low-order, plateau, and cutoff regions spectrum reveal different regimes electron dynamics determining quality. shortest are obtained combining a spectral filtering from end plateau cutoff, far-field spatial that selects single quantum path contribution to This method applies isolated as well pulse trains.
We demonstrate the first experimental complete temporal characterization of high-harmonic XUV pulses by spectral phase interferometry, with an all-optical setup. This method allows us to perform single-shot measurements harmonic profile and phase, revealing a remarkable shot-to-shot stability. characterize harmonics generated in argon 50 fs 800 nm laser pulse. The 11th is found be 22 long negative chirp rate -4.8 x 10(27) s(-2). duration can reduced 13 modulating polarization generating...