B. G. Chéron

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Like any other electric arcs, lighting channels become unstable if the provided power is insufficient. One of the mechanisms assumed to be involved in the ignition of the recoil streamers phase is associated with the development of instability in the lighting channel. In order to study this phenomenon, ONERA in collaboration with EDF has performed 3D(More)
We demonstrate that the interaction between atoms and a Gaussian beam changes the Lorentzian resonance into a so-called Rabi-Lorentzian resonance profile. The existence of such profiles is experimentally evidenced in a dark resonance situation for metastable (4) He, in the absence of any external perturbation. A topological mechanism is shown theoretically(More)
Laser induced plasma spectroscopy (LIPS) is more and more used as diagnostic method in spite of an awkward drawback. Comparison experimental spectra with databanks are obligatory to determine composition of a material with this technique. Modelling the creation phase of this kind of plasma allow to understand the global phenomenon and avoid to resort to(More)
An atmospheric aluminum laser induced plasma is investigated by means of absorption and emission spectroscopy in the near ultraviolet range. The absorbed radiation is produced by a second aluminum laser induced plasma which is generated at adjustable time delay. The measurement of both ground and resonant state number densities are derived from the fitting(More)
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