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Science 26 July 1996:
Vol. 273. no. 5274, pp. 472 - 475
DOI: 10.1126/science.273.5274.472
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Reports
Nonlinear Optics in Relativistic Plasmas and Laser Wake Field
Acceleration of Electrons
D. Umstadter,
S.-Y. Chen,
A. Maksimchuk,
G. Mourou,
R. Wagner
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 109 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.
Center for Ultrafast Optical Science, University of Michigan, Ann
Arbor, MI 48109, USA.
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- The generation of mono-energetic electron beams from ultrashort pulse laser-plasma interactions.
- S.P.D Mangles, K Krushelnick, Z Najmudin, M.S Wei, B Walton, A Gopal, A.E Dangor, S Fritzler, C.D Murphy, A.G.R Thomas, et al. (2006)
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364, 663-677
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