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Enhanced Spatiotemporal Laser-Beam Smoothing in Gas-Jet Plasmas

Abstract : Spatiotemporal smoothing of large-scale laser intensity fluctuations is observed for a laser beam focused into underdense helium plasmas. This smoothing is found to be severely enhanced when focusing the laser beam into a helium gas jet. In contrast to other experiments with preformed plasmas, the average and the peak laser intensities are well below the threshold for ponderomotive self-focusing. The coherence characteristics of the transmitted light are measured for various electron densities, and the smoothing effect is explained by multiple scattering of laser light on self-induced density perturbations.
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Submitted on : Friday, September 17, 2010 - 2:59:36 PM
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Victor Malka, Jérôme Faure, Stefan Hüller, V. T. Tikhonchuk, S. Weber, et al.. Enhanced Spatiotemporal Laser-Beam Smoothing in Gas-Jet Plasmas. Physical Review Letters, American Physical Society, 2003, 90 (7), pp.075002. ⟨10.1103/PhysRevLett.90.075002⟩. ⟨hal-00518894⟩



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