A5101438012- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Laser-Plasma Interactions and Diagnostics
- Solid State Laser Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Laser Design and Applications
- Optical and Acousto-Optic Technologies
- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Laser Material Processing Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Optical Sensing Technologies
- Ocular and Laser Science Research
- Spectroscopy and Laser Applications
- DNA and Nucleic Acid Chemistry
- Optical Coatings and Gratings
- Advanced biosensing and bioanalysis techniques
- Soil Moisture and Remote Sensing
- Photochemistry and Electron Transfer Studies
- Advanced Fluorescence Microscopy Techniques
- Laser-induced spectroscopy and plasma
- Spectroscopy and Quantum Chemical Studies
- Semiconductor Lasers and Optical Devices
- High-pressure geophysics and materials
Fluides, Automatique et Systèmes Thermiques
2009-2015
Centre de Gestion Scientifique
2009
École Polytechnique
2000-2008
Laboratoire d'Informatique de l'École Polytechnique
2007
Laboratoire d'Optique Appliquée
2003-2004
École Normale Supérieure - PSL
2003
Centre National de la Recherche Scientifique
2003
Laboratoire Mécanique des Solides
2002
We explore theoretically and numerically the temporal contrast limitation of a self-referenced spectral interferometry measurement. An experimental confirmation is given by characterization fine compression hollow-core fiber generated sub-15 fs pulses, yielding an accurately measured coherent 50 dB on ±400 time range.
A novel apparatus for the single-shot measurement of temporal pulse contrast modern ultra-short lasers is presented, based on a simple yet conceptual refinement self-referenced spectral interferometry (SRSI) approach. The introduction spatial equivalent delay by tilted beams analyzed with high quality imaging spectrometer, enables unprecedented performance in dynamic, range and resolution simultaneously. Demonstrated consistently simulation experiment at front-end PW laser Draco, full ps...
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 on the setup and commissioning of a compact recollimating single plasma mirror for temporal contrast enhancement at Draco 150 TW laser during laser-proton acceleration experiments. The with without is characterized single-shot by means self-referenced spectral interferometry extended time excursion (SRSI-ETE) unprecedented dynamic range. This allows first measurement trigger point, which interesting quantitative investigation complex pre-plasma formation process surface target used...
Direct amplitude and phase shaping of mid-infrared femtosecond pulses is realized with a calomel-based acousto-optic programmable dispersive filter transparent between 0.4 20 μm. The shaped pulse electric field fully characterized high accuracy, using chirped-pulse upconversion time-encoded arrangement spectral interferometry for direct reconstruction techniques. Complex shapes at center wavelength 4.9 μm are generated resolution 14 cm(-1), which exceeds by factor 5 the reported experimental...
We introduce a new approach to the characterization of femtosecond optical pulses based on remarkably simple setup combining two-photon detector and pulse shaper consisting longitudinal acousto-optic programmable filter. The operation this is demonstrated through use version spectral phase interferometry for direct electric-field reconstruction time-domain instead frequency-domain interferometry.
We investigate, both theoretically and experimentally, the practical use of amplitude phase pulse shapers to characterize ultrashort optical pulses. Pulse greatly simplify setup required for SH-FROG SPIDER measurement techniques, methods can even be implemented with a common layout. also introduce, demonstrate, compare several new interferometric variants these which are compatible basic comprising no more than shaper, type I second-harmonic stage, spectrometer.
We report on 400 nm broadband type I frequency doubling in a noncollinear geometry with pulse-front-tilted and chirped femtosecond pulses (λ =800 nm; Fourier transform limited pulse duration, 45 fs). With moderate power densities (2 to 10 GW/cm2) thus avoiding higher-order nonlinear phenomena, the energy conversion efficiency was up 65%. Second-harmonic of duration shorter than fundamental wave were generated, exhibiting good beam quality no pulse-front tilt. High (20 mJ/pulse) produced 40...
We demonstrate a simple and robust single-shot interferometric technique that allows the in situ measurement of intensity-dependent phase changes experienced by ultrashort laser pulses upon nonlinear propagation. The is applied to characterization carrier-envelope noise hollow fiber compressors both pressure gradient static cell configuration. Measurements performed simultaneously with conventional f-to-2f interferometers before after compression indicate emerging waveguide adds up...
We report on a new approach to measure the accumulated B-integral in regenerative and multipass amplifier stages of ultrashort-pulse high-power laser systems by B-integral-induced coupling between delayed test post-pulses main pulse. A numerical model for such non-linear pulse is presented compared data taken at Draco with self-referenced spectral interferometry (SRSI). The dependence its operation mode enables optimization strategies extracted energy vs. collected B-integral. technique here...
We demonstrate a novel approach for the extension of self-referenced spectral interferometry to temporal characterization few-optical cycle pulses. The new experimental setup is characterized by low dispersion and collinear geometry. 4-fs pulses have been performing single-shot measurements, with high dynamic range on broad region. An independent measurement pulse duration, obtained using attosecond streaking, allowed us cross-check technique.
We present a method extending scanning third-order correlator temporal pulse evolution measurement capabilities of high power short lasers to spectral sensitivity within the range exploited by typical chirped amplification systems. Modelling response achieved angle tuning third harmonic generating crystal is applied and experimentally validated. Exemplary measurements spectrally resolved contrast Petawatt laser frontend illustrate importance full bandwidth coverage for interpretation...
We review here our recent work on a high dynamic range, subpicosecond x-ray streak camera. Our camera (PX1) has been coupled to 10 Hz Ti: sapphire laser system and tested with 500 fs UV light pulses (266 nm) in jitter-free accumulation mode. A novel design for the photoconductive switches that are camera’s deflection plates successfully used eliminate jitter induced by intensity fluctuations temporal shape of beam. Results demonstrate this detection gives simultaneously range resolution at...
Self-referenced spectral interferometry, a newly introduced ultrafast pulse characterization is described and reviewed theoretically. Validity range, temporal dynamic, resolution precision are detailed in the scope of different experimental set-ups. Ultimate performances for ultrashort pulses terms minimal or maximal durations, distortions, bandwidth, dynamic range estimated, simulated explained detail.
Despite the tremendous importance of so-called ionizing radiations (X-rays, accelerated electrons and ions) in cancer treatment, most studies on their effects have focused ionization process itself, neglect excitation events can induce. Here, we show that excited states DNA exposed to be studied picosecond time domain using a recently developed cathodoluminescence system with high temporal resolution. Our study uses table-top ultrafast, UV laser-triggered electron gun delivering bunches keV...
The paper presents an experimental demonstration of a new phase-only measurement technique called local spectral compression (LSC) on chirped pulse amplification (CPA) laser system by inserting acousto-optic programmable dispersive filter (AOPDF) in front the last three-pass amplifier and nonlinear BBO crystal at output. second harmonic signal is recorded with detector. Results demonstrate that LSC method performs adequately for both third order measurements. This shows suitability this to...
A new femtosecond pulses characterization method is presented and experimentally demonstrated. Linear spectral interferometry becomes a self-referenced measurement by the self-creation of reference pulse using shaping optimization non linear temporal filtering.
The impact of spatiotemporal couplings (STCs) on the focal-spot intensity ultra-intense femtosecond lasers scales up with larger beam sizes and shorter pulse duration typically implemented to reach petawatt (PW) intensities. repetition rate such facilities (${ \lt }{10}\;{\rm Hz}$<10Hz) makes single-shot diagnosing STCs mandatory. We present here a new, best our knowledge, diagnostic technique based comparison spatiospectral its nonlinear third-order effect, in this case, cross-polarized...