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Proceedings Paper

Photon frequency up-shifting by an amplified plasma density wake due to two co-propagating laser pulses
Author(s): Gaurav Raj; M. R. Islam; B. Ersfeld; D. A. Jaroszynski
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Paper Abstract

An analytical study of significant photon acceleration (frequency up-shift) in a plasma density wake produced by two laser pulses in the mildly relativistic and linearized regime is presented. The wake amplitude is amplified and its phase controlled using two coaxially, co-propagating laser pulses, which are considered to be identical but separated by a fixed time. A third probe pulse, with a variable delay, is considered as "test particle" or quasi-photon propagating through the amplified density wake, which experiences significant photon acceleration because of the local temporal and spatial variation of the permittivity. The evolution of the "photon" is studied using Hamiltonian theory. The significant frequency up-shift is much larger than that produced by the wake of a single relativistic laser pulse in the highly relativistic nonlinear wake regime. Our study demonstrates that the inter-pulse separation between the "controlling" pulse and the "driver" pulse, producing the amplified density wake, can provide an additional degree of freedom for tuning the maximum up-shift of the probe photon frequency.

Paper Details

Date Published: 7 May 2009
PDF: 8 pages
Proc. SPIE 7359, Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond, 73590L (7 May 2009); doi: 10.1117/12.820959
Show Author Affiliations
Gaurav Raj, Univ. of Strathclyde (United Kingdom)
M. R. Islam, Univ. of Strathclyde (United Kingdom)
B. Ersfeld, Univ. of Strathclyde (United Kingdom)
D. A. Jaroszynski, Univ. of Strathclyde (United Kingdom)


Published in SPIE Proceedings Vol. 7359:
Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond
Dino A. Jaroszynski; Antoine Rousse, Editor(s)

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