Volume 66, Number 3, May 2004
|Page(s)||371 - 377|
|Section||Physics of gases, plasmas and electric discharges|
|Published online||01 April 2004|
Laser pulse frequency up-shifts by relativistic ionization fronts
GoLP-Instituto Superior Tecnico - Complexo I Av. Rovisco Pais, 1049-001 Lisboa, Portugal
2 Laboratoire d'Optique Appliquée, Ensta-Ecole Polytechnique, CNRS UMR 7639 F-91761 Palaiseau Cedex, France
3 Laboratoire CELIA, CNRS-Université Bordeaux 1, UMR 5107 33405 Talence, France
Accepted: 2 March 2004
A multi-terawatt, ultra-short laser pulse was used to create a large, well-defined relativistic ionization front, and the collision of a probe laser pulse with it was studied. Due to the good definition of the ionization front it was also possible to isolate the probe frequency up-shift due to the collision, unlike in previous experiments. A good agreement with the theoretical model for photon acceleration was found. Furthermore, we report novel measurements of ionization front velocities, based on the photon acceleration effect, in excess of .
PACS: 52.38.-r – Laser-plasma interactions / 52.59.-f – Intense particle beams and radiation sources / 52.70.Kz – Optical (ultraviolet, visible, infrared) measurements
© EDP Sciences, 2004
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