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Two statistical regimes in the transition to filamentation
Alexis Gomel, Geoffrey Gaulier, Debbie Eeltink +2
We experimentally investigate fluctuations in the spectrum of ultrashort laser pulses propagating in air, close to the critical power for filamentation. Increasing the laser peak p…
Laser-guided lightning
Aurélien Houard, Pierre Walch, Thomas Produit +25
Electric currents circulating between charged clouds and the earth surface during lightning discharges are responsible for considerable damages and casualties. It is therefore impo…
Ab-initio calculations of laser-atom interactions reveal harmonics feedback during macroscopic propagation
Nicolas Berti, Pierre Béjot, Eric Cormier +3
We couple the full 3D ab initio quantum evolution of the light pulse polarization in interaction with an atom with a propagation model to simulate the propagation of ultrashort las…
Amplification of intense light fields by nearly free electrons
Mary Matthews, Felipe Morales, Alexander Patas +10
Light can be used to modify and control properties of media, as in the case of electromagnetically induced transparency or, more recently, for the generation of slow light or brigh…
Free space laser telecommunication through fog
Guillaume Schimmel, Thomas Produit, Denis Mongin +2
Atmospheric clearness is a key issue for free space optical communications (FSO). We present the first active method to achieve FSO through clouds and fog, using ultrashort high in…
Modifications of filament spectra by shaped octave-spanning laser pulses
Alexander Patas, Mary Matthews, Sylvain Hermelin +4
In this paper we examine the spectral changes in a white light laser filament due to different pulse shapes generated by a pulse shaping setup. We particularly explore how the prop…