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Terahertz generation via optical rectification of x-mode laser in a rippled density magnetized plasma

Phys. Plasmas 16, 103105 (2009); doi:10.1063/1.3248303

Published 21 October 2009

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Lalita Bhasin and V. K. Tripathi
Department of Physics, Indian Institute of Technology, Delhi, New Delhi 110016, India
A scheme of resonant terahertz radiation generation by the optical rectification of a picosecond laser pulse in rippled density magnetized plasma is examined. The x-mode laser pulse, propagating perpendicular to dc magnetic field, exerts a quasistatic ponderomotive force on electrons, imparting them a drift with finite transverse component. The drift velocity beats with the density ripple to produce a current, resonantly driving terahertz radiation at frequency comparable to the inverse pulse duration. The terahertz power scales as the square of density ripple amplitude and rises with magnetic field strength. In the case when magnetic field is azimuthal with appropriate r-dependence, the terahertz power has a ring shape intensity distribution. At laser intensity of ~3×1015  W/cm2, in a 0.01% critical density plasma with 30 kG magnetic field and 30% density ripple, one may have power conversion efficiency of 0.04%. ©2009 American Institute of Physics
History: Received 18 March 2009; accepted 24 September 2009; published 21 October 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/103105/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.50.Jm
    Plasma production and heating by laser beams
  • 52.55.-s
    Magnetic plasma confinement and equilibrium
  • 52.25.-b
    Plasma properties
  • YEAR: 2009

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ISSN:
1070-664X (print)   1089-7674 (online)
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