A5091326034- Spectroscopy and Laser Applications
- Advanced Fiber Laser Technologies
- Laser Design and Applications
- Photonic and Optical Devices
- Dark Matter and Cosmic Phenomena
- Semiconductor Lasers and Optical Devices
- Analytical Chemistry and Sensors
- Atmospheric Ozone and Climate
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Laser-Matter Interactions and Applications
- Radiation Detection and Scintillator Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Cosmology and Gravitation Theories
- Surface Roughness and Optical Measurements
- Nuclear Physics and Applications
- Mechanical and Optical Resonators
- Electron and X-Ray Spectroscopy Techniques
- European Political History Analysis
- Advanced Fiber Optic Sensors
- Geophysics and Sensor Technology
- Quantum optics and atomic interactions
Université Claude Bernard Lyon 1
2010-2024
Centre National de la Recherche Scientifique
2004-2024
Institut Lumière Matière
2012-2024
Laboratoire d'Optique Atmosphérique
2023
Laboratoire de Spectrométrie Ionique et Moléculaire
2006-2016
École Polytechnique Fédérale de Lausanne
2005
Laboratoire Interdisciplinaire de Physique
2004
Université Joseph Fourier
1999-2002
Université Grenoble Alpes
2002
Centre de Gestion Scientifique
2002
We study the response of a high-finesse optical cavity to cw laser during frequency passage through resonance. For that is spectraly larger than resonance, laser-field phase fluctuations are converted into amplitude fluctuations, and injection intrinsically noisy. develop model based on Schawlow-Townes spontaneous-emission broadening discuss in detail its effects high-sensitivity spectroscopic techniques such as cavity-enhanced absorption or ring-down spectroscopy. present realistic...
We report on a promising approach to high-sensitivity anisotropy measurements using high-finesse cavity locked by optical feedback diode laser. provide simple and effective way decouple the weak of interest from inherent mirror's birefringence whose drift may be identified as key limiting parameter in cavity-based techniques. demonstrate shot-noise-limited phase shift resolution previously inaccessible an cavity, readily achieving state-of-the-art level...
We present a new approach to cavity enhanced-direct frequency comb spectroscopy where the full emission bandwidth of titanium:sapphire laser is exploited, currently at gigahertz resolution. The technique based on low-resolution Vernier filtering obtained with an appreciable actively stabilized mismatch between cavity-free spectral range and repetition rate, using diffraction grating split-photodiode. Spectra covering 1300 cm⁻¹ (40 THz) are acquired in less than 100 ms, baseline noise...
We report the first measurement of resolved molecular absorption lines with dual-comb spectroscopy using a Kerr-lens mode-locked bidirectional Ti:sapphire ring laser cavity. A 3 nm broad spectrum has been recorded in 5.3 ms spectral resolution ≈ 1 GHz (0.05 cm-1) corresponding to relative 2.5 × 10-6. The spectrally have demonstrated on oxygen A-band at 394 THz (760 nm, 13 000 and was obtained two free-running 100 fs trains pulses without need for active phase stabilization protocol nor...
We present the results of an experimental and theoretical study on optimum design shear-force sensors, used in scanning probe microscopes. have optimized a configuration consisting tuning-fork/fiber-tip assembly, achieving quality factors (Q) exceeding 8000, presented analysis wherein force holding fiber fork contact is provided solely by elastic mechanical deformation, which allows full control performance system. On this basis, we constructed high-quality-factor with glued onto tuning fork.
Tunable diode laser absorption spectroscopy (TDLAS) is used to measure the 6s 2 1 S-5d6p 3 D 0 line profile of a Ba atomic beam produced in molecular epitaxy (MBE) reactor. Despite noisy MBE environment, signal-to-noise ratio up 100 obtained thanks thorough optimization measurement setup. A model that realistically describes this presented, taking into account angular distribution concentration as well reactor and setup geometry. Our results highlight influence latter on Doppler broadening,...
The OSQAR photon regeneration experiment searches for pseudoscalar and scalar axion-like particles by the method of "Light Shining Through a Wall", based on assumption that these weakly interacting sub-eV couple to two photons give rise quantum oscillations with optical in strong magnetic field. No excess events has been observed, which constrains di-photon coupling strength both down $5.7 \cdot 10^{-8}$ GeV$^{-1}$ massless limit. This result is most stringent constraint ever achieved...
Vernier spectroscopy is a frequency comb-based technique employing optical cavities for filtering of the comb and enhancement interaction length with sample. Depending on ratio cavity free spectral range repetition rate, transmits either widely spaced individual lines (comb-resolved spectroscopy) or groups lines, called orders (continuous-filtering spectroscopy, CF-VS). The enables use low-resolution spectrometers to resolve orders. has been implemented using various near- mid-infrared...
Optical spectroscopic methods based on direct absorption offer a quantitative measurement of the absorbance, which is product concentration, molar coefficient transition being observed and length path. An sensitivity adequate for trace detection may be achieved by increasing path length. One solution offered cavity ringdown spectroscopy (CRDS), attractive its simplicity. We recently demonstrated that an external diode laser (ECDL) can conveniently employed CRDS instead pulsed laser, contrary...
We recently demonstrated trace detection using Cavity Ring Down Spectroscopy (CRDS) coupled with telecom DFB diode lasers. Our scheme exploits optical feedback from a V-shaped cavity back to the laser. built trace-gas detectors for CH4 and HF, characterized by low cost, simplicity, compactness sensitivity. Operating wavelength are 1.312 micrometers HF 1.65 methane. The setup includes distributed feed-back (DFB) laser, temperature stabilized Peltier, collimating lens, 2 steering mirrors,...
Recent intensive theoretical and experimental studies shed light on possible new physics beyond the standard model of particle physics, which can be probed with sub-eV energy experiments. In second run OSQAR photon regeneration experiment, looks for conversion to axion (or Axion-Like Particle), two spare superconducting dipole magnets Large Hadron Collider (LHC) have been used. this paper we report first results obtained from a beam propagating in vacuum within 9 T field LHC magnets. No...
Recent theoretical and experimental studies highlight the possibility of new fundamental particle physics beyond Standard Model that can be probed by sub-eV energy experiments. The OSQAR photon regeneration experiment looks for "Light Shining through a Wall" (LSW) from quantum oscillation optical photons into "Weakly Interacting Sub-eV Particles" (WISPs), like axion or axion-like particles (ALPs), in 9 T transverse magnetic field over unprecedented length $2 \times 14.3$ m. No excess events...