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Physics of Plasmas / Volume 18 / Issue 12 / ARTICLES / Lasers, Particle Beams, Accelerators, Radiation Generation

Phys. Plasmas 18, 123106 (2011); http://dx.doi.org/10.1063/1.3671973 (4 pages)

Terahertz generation from laser filaments in the presence of a static electric field in a plasma

Lalita Bhasin and V. K. Tripathi

Physics Department, Indian Institute of Technology, Delhi, New Delhi 110016, India

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(Received 23 September 2011; accepted 15 November 2011; published online 29 December 2011)

Two femtosecond laser pulses with frequencies ω1 and ω2 that undergo filamentation in a plasma couple nonlinearly in the presence of a transverse, static electric field to generate terahertz wave at the frequency ω1-ω2. The coupling is enhanced in the presence of the static electric field. We develop a theoretical model and observe over 30 times increase in the magnitude of normalized terahertz amplitude by applying a dc electric field ~50kV/cm.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. NONLINEAR CURRENT
  3. TERAHERTZ RADIATION GENERATION
  4. DISCUSSION

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KEYWORDS and PACS

Keywords

electric field effects, high-speed optical techniques, nonlinear optics, plasma light propagation, plasma nonlinear processes, terahertz wave generation

PACS

  • 52.38.Hb

    Self-focussing, channeling, and filamentation in plasmas

  • 52.25.Os

    Emission, absorption, and scattering of electromagnetic radiation

  • 42.65.Jx

    Beam trapping, self-focusing and defocusing; self-phase modulation

  • 42.65.Ky

    Frequency conversion; harmonic generation, including higher-order harmonic generation

  • 52.35.Mw

    Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)

  • 42.65.Re

    Ultrafast processes; optical pulse generation and pulse compression

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3671973

PUBLICATION DATA

ISSN

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

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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