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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 22 — Oct. 22, 2012
  • pp: 24741–24747

Phase-stable sub-cycle mid-infrared conical emission from filamentation in gases

Yutaka Nomura, Hideto Shirai, Kenta Ishii, Noriaki Tsurumachi, Alexander A. Voronin, Aleksei M. Zheltikov, and Takao Fuji  »View Author Affiliations

Optics Express, Vol. 20, Issue 22, pp. 24741-24747 (2012)

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Sub-single-cycle pulses in the mid-infrared (MIR) region were generated through a conical emission from a laser-induced filament. Fundamental and second-harmonic pulses of 25-fs Ti:sapphire amplifier output were focused into argon to produce phase-stable broadband MIR pulses in a well-focusable ring-shaped beam. The beam profile and spectrum of the MIR field are accurately reproduced with a simple calculation based on a four-wave mixing process. The ring-shaped pattern of the MIR beam originates from a dramatic confocal-parameter mismatch between the MIR field and the laser beams.

© 2012 OSA

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

ToC Category:
Ultrafast Optics

Original Manuscript: August 17, 2012
Revised Manuscript: September 23, 2012
Manuscript Accepted: September 25, 2012
Published: October 15, 2012

Yutaka Nomura, Hideto Shirai, Kenta Ishii, Noriaki Tsurumachi, Alexander A. Voronin, Aleksei M. Zheltikov, and Takao Fuji, "Phase-stable sub-cycle mid-infrared conical emission from filamentation in gases," Opt. Express 20, 24741-24747 (2012)

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