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Rapid filamentation of high power lasers at the quarter critical surface
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Brady, C. S., Lawrence-Douglas, A. and Arber, T. D. (2012) Rapid filamentation of high power lasers at the quarter critical surface. Physics of Plasmas, Volume 19 (Number 6). Article number 063112. doi:10.1063/1.4729333 ISSN 1070-664X.
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Official URL: http://dx.doi.org/10.1063/1.4729333
Abstract
A novel mechanism for initiating laser filamentation for intensities above 5 × 1017 W/cm2 is presented, seeded by the transient interference of an incident laser and its Raman backscattered daughter wave. For lasers propagating up short scale-length density gradients, the Raman reflectivity is peaked near the relativistically corrected quarter critical surface (RCQCS) and thus filamentation is observed to start on this surface. The filamentation at the RCQCS occurs on timescales comparable to the laser period. A series of 2D particle-in-cell (PIC) simulations confirm this physical model. Growth rates are obtained from simulations for a variety of simulation parameters and a simplified model in which the RCQCS behaves as a partially reflecting mirror, with the reflected light at double the wavelength of the incident light, is shown to reproduce the number and approximate location of filaments from PIC simulations. It was also proposed that field ionisation may alter RCQCS formation and the method of inclusion for this into the PIC simulation is presented. Additional simulations demonstrate field ionisation to have a negligible effect on the formation of the RCQCS. The implications of this filamentation mechanism for plasma experiments which require focused light of intensities above 5 × 1017 W/cm2 to propagate beyond the RCQCS are discussed.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physics of Plasmas | ||||
Publisher: | American Institute of Physics | ||||
ISSN: | 1070-664X | ||||
Official Date: | 22 June 2012 | ||||
Dates: |
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Volume: | Volume 19 | ||||
Number: | Number 6 | ||||
Page Range: | Article number 063112 | ||||
DOI: | 10.1063/1.4729333 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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