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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 21 — Oct. 13, 2008
  • pp: 16999–17006

Strong terahertz pulse generation by chirped laser pulses in tenuous gases

W.-M. Wang, Z.-M. Sheng, H.-C. Wu, M. Chen, C. Li, J. Zhang, and K. Mima  »View Author Affiliations

Optics Express, Vol. 16, Issue 21, pp. 16999-17006 (2008)

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Mechanism of terahertz (THz) pulse generation in gases irradiated by ultrashort laser pulses is investigated theoretically. Quasi-static transverse currents produced by laser field ionization of gases and the longitudinal modulation in formed plasmas are responsible for the THz emission at the electron plasma frequency, as demonstrated by particle-in-cell simulations including field ionization. The THz field amplitude scales linearly with the laser amplitude, which, however, holds only when the latter is at a moderate level. To overcome this limitation, we propose a scheme using chirped laser pulses irradiating on tenuous gas or plasma targets, which can generate THz pulses with amplitude 10–100 times larger than that from the well-known two-color laser scheme, enabling one to obtain THz field up to 10MV/cm with incident laser at ~1016W/cm2.

© 2008 Optical Society of America

OCIS Codes
(260.5210) Physical optics : Photoionization
(300.2140) Spectroscopy : Emission
(300.6270) Spectroscopy : Spectroscopy, far infrared
(350.5400) Other areas of optics : Plasmas

ToC Category:

Original Manuscript: July 29, 2008
Revised Manuscript: August 31, 2008
Manuscript Accepted: September 1, 2008
Published: October 10, 2008

W.-M. Wang, Z.-M. Sheng, H.-C. Wu, M. Chen, C. Li, J. Zhang, and K. Mima, "Strong terahertz pulse generation by chirped laser pulses in tenuous gases," Opt. Express 16, 16999-17006 (2008)

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