A5048907039- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Optical Network Technologies
- Photonic and Optical Devices
- Nonlinear Photonic Systems
- Atmospheric chemistry and aerosols
- Photonic Crystal and Fiber Optics
- Laser-induced spectroscopy and plasma
- Atmospheric and Environmental Gas Dynamics
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Quantum Chemical Studies
- Mechanical and Optical Resonators
- Random lasers and scattering media
- Advanced Photonic Communication Systems
- Advanced Fiber Optic Sensors
- Cold Atom Physics and Bose-Einstein Condensates
- Nonlinear Dynamics and Pattern Formation
- Ocean Waves and Remote Sensing
- Neural Networks and Reservoir Computing
- Laser Design and Applications
- Quantum optics and atomic interactions
- Chaos control and synchronization
- Oceanographic and Atmospheric Processes
- Strong Light-Matter Interactions
- Terahertz technology and applications
Laboratoire Interdisciplinaire Carnot de Bourgogne
2014-2023
Université de Bourgogne
2014-2023
Centre National de la Recherche Scientifique
2014-2023
University of Geneva
2013-2023
Université Bourgogne Franche-Comté
2018-2022
Institut de Chimie et des Matériaux Paris-Est
2018
Although the temperature of a thermodynamic system is usually believed to be positive quantity, under particular conditions, negative-temperature equilibrium states are also possible. Negative-temperature equilibriums have been observed with spin systems, cold atoms in optical lattices, and two-dimensional quantum superfluids. Here we report observation Rayleigh-Jeans thermalization light waves states. The wave relaxes state through its propagation multimode fiber-i.e., conservative...
We address the problem of thermalization in presence a time-dependent disorder framework nonlinear Schrödinger (or Gross-Pitaevskii) equation with random potential. The to Rayleigh-Jeans distribution is driven by nonlinearity. On other hand, structural responsible for relaxation toward homogeneous equilibrium (particle equipartition), which thus inhibits (energy equipartition). basis wave turbulence theory, we derive kinetic that accounts strong disorder. theory unveils interplay and It...
Abstract We measured the chemical composition and size distribution of aerosols generated by femtosecond-Terawatt laser pulses in atmosphere using an aerosol mass spectrometer (AMS). show that nitric acid condenses form ammonium nitrate oxidized volatile organics also contribute to particle growth. These two components account for thirds one third, respectively, dry laser-condensed mass. They appear different modes centred at 380 nm 150 nm. The number concentration particles between 25 300...
Abstract The wave turbulence theory predicts that a conservative system of nonlinear waves can exhibit process condensation, which originates in the singularity Rayleigh-Jeans equilibrium distribution classical waves. Considering light propagation multimode fiber, we show condensation is driven by an energy flow toward higher-order modes, and bi-directional redistribution wave-action (or power) to fundamental mode modes. analysis near-field intensity provides experimental evidence this...
The influence of aerosols on climate is highly dependent the particle size distribution, concentration, and composition. In particular, latter influences their ability to act as cloud condensation nuclei, whereby they impact coverage precipitation. Here, we simultaneously measured concentration from sea spray over North Atlantic board exhaust-free solar-powered vessel "PlanetSolar", surface physico-chemical parameters. We identified organic-bearing particles based individual fluorescence...
The impact of nonadiabatic laser-induced molecular alignment on filamentation is numerically studied. Weak and strong field model impulsive are compared in the context nonlinear pulse propagation. It shown that widely used weak describing refractive index modification induced by accurately reproduces propagation dynamics providing only a single involved during experiment. On contrary, it fails at reproducing experienced an intense laser traveling wake second pulse. discrepancy depends...
Strong deformation of ultrashort laser pulse shapes is unavoidable when delivering high intensities at remote distances due to nonlinear effects taking place while propagating. Relying on the reversibility filamentation, we propose explicitly design so that propagation serves as a field synthesizer target location. Such an approach allows, for instance, coherent control molecules distance, in context standoff detection pathogens or explosives.
While propagating in transparent media, near-infrared multiterawatt (TW) laser beams break up a multitude of filaments typically 100-200 um diameter with peak intensities as high 10 to 100 TW/cm^{2}. We observe phase transition at incident beam 0.4 TW/cm^{2}, where the interaction between induce solidlike two-dimensional crystals 2.7 mm lattice constant, independent initial diameter. Below we evidence mixed state which some are closely packed localized clusters, nucleated on inhomogeneities...
We study the triggering of single filaments due to turbulence in beam path for a laser power below filamenting threshold. Turbulence can act as switch between not and producing filaments. This positive effect on filament probability, combined with our observation off-axis filaments, suggests underlying mechanism is modulation instability caused by transverse perturbations. hereby experimentally explore interaction turbulence, commonly associated multiple single-filament regime.
We investigate the reversibility of laser filamentation, a self-sustained, non-linear propagation regime including dissipation and time-retarded effects. show that even losses related to ionization marginally affect possibility reverse propagating ultrashort pulses back initial conditions, although they make it prone finite-distance blow-up susceptible prevent backward propagation.
In this manuscript, we experimentally and numerically investigate the chaotic dynamics of state-of-polarization in a nonlinear optical fiber due to cross-interaction between an incident signal its intense backward replica generated at fiber-end through amplified reflective delayed loop.Thanks cross-polarization interaction two-delayed counter-propagating waves, output polarization exhibits fast temporal dynamics, which enable powerful scrambling process with moving speeds up 600-krad/s.The...
We report on the experimental observation of flipping polarization domain walls in a fiber Kerr resonator. These topological knots exhibit period-doubling behavior and can be addressed individually as bit-entities for data storage.
In this paper, we report both numerically and experimentally an unexpected phenomenon of self-polarization occurring in the middle point isotropic optical fiber when two uncorrelated partially polarized waves are simultaneously injected at ends fiber. More precisely, demonstrate that counterpropagating equal intensity exhibit a spontaneous organization their polarization states around pools attraction just propagation, then recover state respective outputs. The effect remains hidden within...
We couple the full 3D ab initio quantum evolution of light pulse polarization in interaction with an atom a propagation model to simulate ultrashort laser pulses over macroscopic dimensions, presence self-generated harmonics up order 11. evidence clear feedback generated on propagation, influence ionization probability as well yield harmonic generation itself.
Ever-growing concerns and governmental restrictions related to the use of pesticides in modern agriculture has driven need for more adept decision-making tools minimize unnecessary treatments whilst still efficiently preventing a spread infection. To this effect, network cost-effective, laser-based holographic detectors were developed placed vineyards Switzerland France with objective detecting identifying airborne spores downy powdery mildew before they have potential infect crops. The data...
We evaluate the linearity of three electric measurement techniques initial electron density in laser filaments by comparing their results for a pair and sum each individual filament. The conductivity measured between two plane electrodes longitudinal configuration is linear within 2 % provided field kept below 100 kV/m. Furthermore, simulations show that signal behaves like amount generated free electrons. slow ionic current with parallel representative charge available filament, after...
We consider the propagation of temporally incoherent waves in multimode optical fibers (MMFs) framework nonlinear Schr\"odinger (NLS) equation accounting for impact natural structural disorder that affects light standard MMFs (random mode coupling and polarization fluctuations). By averaging dynamics over fast disordered fluctuations, we derive a Manakov from NLS equation, which reveals Raman effect introduces previously unrecognized among modes. Applying wave turbulence theory on very...