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Enhanced Forward Scattering in the Case of Two Crossed Laser Beams Interacting with a Plasma

2000; American Physical Society; Volume: 85; Issue: 8 Linguagem: Inglês

10.1103/physrevlett.85.1658

1092-0145

C. Labaune, H. A. Baldis, E. Schifano, B. S. Bauer, A. V. Maximov, Ivan Ourdev, W. Rozmus, D. Pesme,

Laser-induced spectroscopy and plasma

The nonlinear enhancement of large-angle forward scattering of two identical laser beams propagating in a preformed plasma has been observed experimentally. The spectral analysis of the forward-scattered light shows two components, one which is unshifted with respect to the initial laser light frequency, and the other which is redshifted by a few angstroms. The redshifted component is found to be strongly enhanced in the case of crossed beam interaction in comparison with that of one beam illumination. Two-dimensional numerical simulations show that this enhancement is due to large-angle forward stimulated Brillouin scattering in which each beam serves as seed for the forward scattering of the other.