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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 22 — Oct. 25, 2010
  • pp: 23173–23182

Terahertz white-light pulses from an air plasma photo-induced by incommensurate two-color optical fields

Mark D. Thomson, Volker Blank, and Hartmut G. Roskos  »View Author Affiliations

Optics Express, Vol. 18, Issue 22, pp. 23173-23182 (2010)

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We demonstrate plasma-THz generation in ambient air with two-color (ω-2ω) optical excitation using input pulses with a bandwidth supporting sub-20-fs duration, yielding a continuous bandwidth exceeding 100 THz with no significant roll-off and a pulse energy of 360 nJ at a 1-kHz repetition rate. The key aspect in achieving this performance is an optimized geometry of the second-harmonic generation (SHG) crystal, producing a 2ω-field detuned from the second-harmonic of the ω-field, which promotes both a high polarization bandwidth and optimal ω-2ω temporal overlap in the plasma, as supported by theoretical results.

© 2010 Optical Society of America

OCIS Codes
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(350.5400) Other areas of optics : Plasmas
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Nonlinear Optics

Original Manuscript: August 9, 2010
Revised Manuscript: September 16, 2010
Manuscript Accepted: September 22, 2010
Published: October 19, 2010

Mark D. Thomson, Volker Blank, and Hartmut G. Roskos, "Terahertz white-light pulses from an air plasma photo-induced by incommensurate two-color optical fields," Opt. Express 18, 23173-23182 (2010)

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