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Evidence of photon acceleration by laser wake fields

Research output: Contribution to journalJournal article

Published
  • C. D. Murphy
  • J. Vieira
  • A. J. W. Reitsma
  • R. Bingham
  • J. L. Collier
  • E. J. Divall
  • P. S. Foster
  • C. J. Hooker
  • A. J. Langley
  • Peter A. Norreys
  • R. A. Fonseca
  • F. Fiuza
  • L. O. Silva
  • J. T. Mendonça
  • Warren B. Mori
  • J. G. Gallacher
  • R. Viskup
  • D. A. Jaroszynski
  • Stuart P. D. Mangles
  • Karl Krushelnick
  • Zulfikar Najmudin
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Article number033108
<mark>Journal publication date</mark>03/2006
<mark>Journal</mark>Physics of Plasmas
Issue number3
Volume13
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Photon acceleration is the phenomenon whereby a light wave changes color when propagating through a medium whose index of refraction changes in time. This concept can be used to describe the spectral changes experienced by electromagnetic waves when they propagate in spatially and temporally varying plasmas. In this paper the detection of a large-amplitude laser-driven wake field is reported for the first time, demonstrating photon acceleration. Several features characteristic of photon acceleration in wake fields, such as splitting of the main spectral peak and asymmetries between the blueshift and redshift for large shifts, have been observed. The experiment is modeled using both a novel photon-kinetic code and a three-dimensional particle-in-cell code. In addition to the wide-ranging applications in the field of compact particle accelerators, the concept of wave kinetics can be applied to understanding phenomena in nonlinear optics, space physics, and fusion energy research.