Interaction of ultraintense laser pulses with an underdense,preformed plasma channel |
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| Authors: | Malka V. Faure J. Marques J.R. Amiranoff F. Courtois C. Najmudin Z. Krushelnick K. Salvati M.R. Dangor A.E. |
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| Affiliation: | LULI, Ecole Polytech.-Universite Pierre et Marie Curie, Palaiseau; |
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| Abstract: | We report on experimental results regarding the propagation of ultraintense laser pulses in a preformed plasma channel. In this experiment, the long (4-mm) fully ionized plasma channel created by the amplified spontaneous emission (ASE) was measured by interferometry before and after the propagation of the short laser pulse. Forward spectra show a cascade of Raman satellites, which merge with one another when the laser power was increased up to critical power for relativistic self-focusing Pc. The number of filaments measured by interferometry increases when the laser power increases. High conversion efficiency (≈10%) of second harmonic generation was observed in the interaction |
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