A5016499010- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Laser-Plasma Interactions and Diagnostics
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Photonic Crystal and Fiber Optics
- Laser Design and Applications
- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Liquid Crystal Research Advancements
- Optical Polarization and Ellipsometry
- Photonic and Optical Devices
- Nonlinear Optical Materials Studies
- Spectroscopy and Quantum Chemical Studies
- Ocular and Laser Science Research
- Cephalopods and Marine Biology
- Advanced Fluorescence Microscopy Techniques
- Terahertz technology and applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Mass Spectrometry Techniques and Applications
- Animal testing and alternatives
- Neurobiology and Insect Physiology Research
- Insect and Arachnid Ecology and Behavior
- Quantum optics and atomic interactions
- Semiconductor Lasers and Optical Devices
Institut de Physique de Nice
2016-2024
Université Côte d'Azur
2017-2023
Centre National de la Recherche Scientifique
2014-2023
Observatoire de la Côte d’Azur
2019-2023
Centre Procédés, Energies Renouvelables et Systèmes Energétiques
2020-2022
École Polytechnique
2010-2020
Laboratoire d'Optique Appliquée
2011-2020
École Nationale Supérieure de Techniques Avancées
2010-2020
Canadian Nautical Research Society
2019
Luciol Instruments (Switzerland)
2019
We take advantage of nonlinear properties associated with ?(3) tensor elements in BaF2 cubic crystal to improve the temporal contrast femtosecond laser pulses. The technique presented is based on cross-polarized wave (XPW) generation. have obtained a transmission efficiency 10% and 10?10 an input pulse millijoule range. This filter does not affect spectral shape or phase cleaned pulse. It also acts as efficient spatial filter. In this method enhancement limited only by extinction ratio...
Abstract The development of ultra-intense and ultra-short light sources is currently a subject intense research driven by the discovery novel phenomena in realm relativistic optics, such as production ultrafast energetic particle radiation beams for applications. It has been long-standing challenge to unite two hitherto distinct classes sources: those achieving intensity with pulse durations approaching single cycle. While former class traditionally involves large-scale amplification chains,...
Carrier envelope phase stable 4 fs near-IR pulses with 3 mJ energy were generated by spectral broadening of circularly polarized 8 in a differentially pumped 2 m long composite stretched exible hollow ber. The characterized using both second-harmonic generation frequency-resolved optical gating (SHG-FROG) and SHG d-scan methods
We report the generation of 4.3 fs, 1 mJ pulses at kHz using a hollow-core fiber compressor seeded with circularly polarized laser pulses. observe up to 30% more energy throughput compared case linearly input, together significantly improved output spectral stability. Seeding proves be an effective approach for high-energy operation hollow-fiber compression technique.
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.
The current paradigm of isolated attosecond pulse production requires a few-cycle as the driver for high-harmonic generation that has cosine-like electric field stabilized with respect to peak envelope. Here, we present simulations and experimental evidence light can be restricted one or few cycles on leading edge laser by gating mechanism employs time-dependent ionization conversion medium. This scheme enables broadband tunable pulses. Instead fixing carrier-envelope phase produce cosine...
Hyperspectral imaging collects knowledge about the spectral content enclosed in a given target. For such investigations, fundamental requirements include ability to extend range, improve resolution, and achieve large field of view together with compactness robustness. Here we introduce new method polarized hyperspectral that makes use two cascaded liquid crystal cells demonstrate act as Fourier spectrometer when appropriately driven dynamic voltage step. One thick cell (200 μm), electrically...
Nonlinear elliptical polarization rotation is used to improve the contrast of femtosecond pulses by several orders magnitude. Using nonlinear induced birefringence in air, we produced cleaned with an energy a few hundreds microjoules. This technique presents major advantages, such as convenience and stability setup. We investigated phase profile required for obtaining high-energy pulses. No distortion observed, spatial quality beam preserved.
We report on direct observation of temporal contrast degradation short pulses amplified by optical parametric chirped-pulse amplification. show that, despite injection seeding, quantum-noise-induced fast modulations (< 50 ps) the profile pump pulse are imprinted spectrum chirped and give rise to a large picosecond pedestal in time domain.
We present a practical spatial-domain interferometer for characterizing the electronic density gradient of laser-induced plasma mirrors with sub-30-femtosecond temporal resolution. Time-resolved spatial imaging an intensity-shaped pulse reflecting off expanding mirror induced by time-delayed pre-pulse allows us to measure characteristic gradients 10-100 nm expansion velocity 10.8 nm/ps. Spatial-domain interferometry (SDI) can be generalized ultrafast μm size phenomena at surfaces.
Accelerating electrons to relativistic energies has applications in time-resolved electron diffraction. Experiments and simulations show that inhomogeneities a laser's electric field affect the quality of accelerated beam.
We report for the first time on anticorrelated emission of high-order harmonics and energetic electron beams from a solid-density plasma with sharp vacuum interface-plasma mirror-driven by an intense ultrashort laser pulse. highlight key role played nanoscale structure surface during interaction measuring spatial spectral properties emitted mirror. show that behavior mirror can be controlled tuning scale length density gradient, which is measured in situ using spatial-domain interferometry.
We describe a method that overcomes the observed saturation effect in cross polarized wave (XPW) generation. The previously reported internal efficiencies for XPW generation are known to be limited around 15% whatever length of nonlinear medium and/or input intensity values are. At opposite, theoretical limit had been estimated close 25%. Here we show using two thin BaF(2) crystals separated at optimum distance level efficiency can drastically increased. An 30% is demonstrated experimentally...
We propose a highly efficient scheme for temporal filters devoted to femtosecond pulse contrast enhancement. The filter is based on cross-polarized wave generation with spatially suger-Gaussian-shaped beam. In single nonlinear crystal the energy conversion can reach 28%. demonstrate that process enables significant spectral broadening. For an efficiency of 23% shortening estimated 2.2, leading intensity transmission 50%.
Carrier-envelope phase (CEP) stabilization of a femtosecond chirped-pulse amplification system featuring compact transmission grating compressor is demonstrated. The includes two stages and routinely generates phase-stable (~250 mrad rms) 2 mJ, 25 fs pulses at 1 kHz. Minimizing the optical pathway in enables without feedback control separation or beam pointing. We also demonstrate for first time to best our knowledge, out-of-loop CEP using an acousto-optic programmable dispersive filter...
We report here an alternative and more efficient orientation of cubic crystals for generation cross-polarized femtosecond laser pulses. show both theoretically experimentally that the cross polarized wave (XPWG) is when fundamental beam propagates along [011] direction (holographic cut) in crystal than [001] previously reported. With [011]-cut BaF2 we measured highest XPWG conversion efficiencies. prove other very important advantages approach: weak induced phase mismatch no need its compensation.
We demonstrate a simple and robust passive coherent combining technique for temporal compression of millijoule energy laser pulses down to few-cycle duration in gas-filled hollow fiber. High efficiency is achieved by using carefully oriented calcite plates pulse division recombination. Carrier-envelope phase (CEP)-stable, 6-fs, 800-nm with more than 0.6 mJ are routinely generated. This method could aid the scaling CEP-stable hollow-fiber compressor systems.
We have investigated theoretically and experimentally the nonlinear propagation of intense elliptically polarized light pulses along a fourfold axis cubic crystal BaF2. Third-order optical processes generate cross-polarized wave, an effect that presents significant possibilities for application in femtosecond pulse contrast enhancement. The experimental setup consists input linear passes through sandwiched between two crossed quarter-wave plates. exit orthogonal polarization-state production...
The generation of high contrast and ultrashort laser pulses via a compact energy-scalable cross polarized wave filter is presented. setup incorporates waveguide spatial into single crystal XPW configuration, enabling energy intensity transmission, efficient enhancement pulse shortening at the multi-mJ level. Excellent conversion up to 33% (global efficiency: 20%, transmission: 40%) led an output 650 µJ for input 3.3 mJ. Additionally, under specific phase conditions, allowed from 25 fs 9.6...