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Title:
Nonlinear Optics in Relativistic Plasmas and Laser Wake Field Acceleration of Electrons
Authors:
Umstadter, D.; Chen, S.-Y.; Maksimchuk, A.; Mourou, G.; Wagner, R.
Publication:
Science, Volume 273, Issue 5274, pp. 472-475
Publication Date:
07/1996
Origin:
JSTOR
Bibliographic Code:
1996Sci...273..472U

Abstract

When a terawatt-peak-power laser beam is focused into a gas jet, an electron plasma wave, driven by forward Raman scattering, is observed to accelerate a naturally collimated beam of electrons to relativistic energies (up to 10^9 total electrons, with an energy distribution maximizing at 2 megaelectron volts, a transverse emittance as low as 1 millimeter-milliradian, and a field gradient of up to 2 gigaelectron volts per centimeter). Electron acceleration and the appearance of high-frequency modulations in the transmitted light spectrum were both found to have sharp thresholds in laser power and plasma density. A hole in the center of the electron beam may indicate that plasma electrons were expelled radially.

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