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Updated: Jul 18, 2026

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Observation of saturation of energy transfer between copropagating beams in a flowing plasma
R K Kirkwood1, J D Moody, A B Langdon
1Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
Abstract:
Experiments demonstrate energy and power transfer between copropagating, same frequency, beams crossing at a small angle in a plasma with a Mach 1 flow. The process is interpreted as amplification of the low intensity probe beam by the stimulated scatter of the high intensity pump beam. The observed probe amplification increases slowly with pump intensity and decreases with probe intensity, indicative of saturation limiting the energy and power transfer due to ion-wave nonlinearities and localized pump depletion. The results are consistent with numerical modeling including ion-wave nonlinearities.
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