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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 8 — Apr. 16, 2007
  • pp: 4577–4584

Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields

K. Y. Kim, J. H. Glownia, A. J. Taylor, and G. Rodriguez  »View Author Affiliations

Optics Express, Vol. 15, Issue 8, pp. 4577-4584 (2007)

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A transient photocurrent model is developed to explain coherent terahertz emission from air irradiated by a symmetry-broken laser field composed of the fundamental and its second harmonic laser pulses. When the total laser field is asymmetric across individual optical cycles, a non-vanishing electron current surge can arise during optical field ionization of air, emitting a terahertz electromagnetic pulse. Terahertz power scalability is also investigated, and with optical pump energy of tens of millijoules per pulse, peak terahertz field strengths in excess of 150 kV/cm are routinely produced.

© 2007 Optical Society of America

OCIS Codes
(260.5210) Physical optics : Photoionization
(300.6270) Spectroscopy : Spectroscopy, far infrared
(320.7120) Ultrafast optics : Ultrafast phenomena
(350.5400) Other areas of optics : Plasmas

ToC Category:
Ultrafast Optics

Original Manuscript: December 22, 2006
Revised Manuscript: March 16, 2007
Manuscript Accepted: March 16, 2007
Published: April 3, 2007

Ki-Yong Kim, James H. Glownia, Antoinette J. Taylor, and George Rodriguez, "Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields," Opt. Express 15, 4577-4584 (2007)

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