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Physics of Plasmas / Volume 16 / Issue 5 / INVITED PAPERS / Lasers, Particle Beams, Accelerators, Radiation Generation

Phys. Plasmas 16, 056706 (2009); http://dx.doi.org/10.1063/1.3134422 (8 pages)

Generation of coherent terahertz radiation in ultrafast laser-gas interactions a

a Paper NI2 3, Bull. Am. Phys. Soc. 53, 161 (2008).
Ki-Yong Kim

Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA

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(Received 15 December 2008; accepted 21 April 2009; published online 14 May 2009)

The generation of intense terahertz radiation in ultrafast laser-gas interactions is studied on a basis of transient electron current model. When an ultrashort pulse laser’s fundamental and its second harmonic fields are mixed to ionize a gas, a nonvanishing, directional photoelectron current can be produced, which simultaneously emits terahertz radiation in the far field. Here, the generation mechanism is examined with an analytic derivation and numerical simulations, in which tunneling ionization and subsequent electron motion in the combined laser field play a key role. In the simulations, three types of laser-gas interactions are considered: (i) mixing the fundamental and its second harmonic fields, (ii) mixing nonharmonic, two-color fields, and (iii) focusing single-color, few-cycle pulses. In these interactions, terahertz generation and other nonlinear effects driven by the transient current are investigated. In particular, anticorrelation between terahertz and second (or third) harmonic generation is observed and analyzed.

© 2009 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. TERAHERTZ GENERATION MECHANISM
  3. SIMULATIONS
    1. Fundamental and second harmonic mixing
    2. Nonharmonic two-color mixing
    3. Few-cycle pulses
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

high-speed optical techniques, ionisation, laser beam effects, optical focusing, optical harmonic generation, photoemission, plasma light propagation, plasma nonlinear processes, plasma simulation, plasma transport processes, submillimetre wave generation, tunnelling

PACS

  • 52.25.Os

    Emission, absorption, and scattering of electromagnetic radiation

  • 52.38.Dx

    Laser light absorption in plasmas (collisional, parametric, etc.)

  • 42.65.Re

    Ultrafast processes; optical pulse generation and pulse compression

  • 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.)

  • 52.25.Fi

    Transport properties

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3134422

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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