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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 22 — Nov. 15, 2007
  • pp: 3330–3332

Generation of sub-two-cycle mid-infrared pulses by four-wave mixing through filamentation in air

Takao Fuji and Toshinori Suzuki  »View Author Affiliations

Optics Letters, Vol. 32, Issue 22, pp. 3330-3332 (2007)

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Generation of sub-two-cycle, microjoule pulses in the mid-infrared region is demonstrated. Fundamental and second-harmonic pulses of 25 fs Ti:sapphire amplifier output were focused into the air to produce extremely broadband mid-infrared pulses by four-wave difference-frequency generation through the filamentation. The full width at half-maximum of the spectral bandwidth reaches one octave ( 2.5 5.5 μ m ) , which is sufficiently broad for sub-single-cycle pulse generation. The pulse width was estimated to be 13 fs , without any compressors, by cross-correlation frequency resolved optical gating. The output energy of more than a few microjoule is sufficient for spectroscopy.

© 2007 Optical Society of America

OCIS Codes
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(260.3060) Physical optics : Infrared
(320.5550) Ultrafast optics : Pulses

ToC Category:
Ultrafast Optics

Original Manuscript: August 6, 2007
Revised Manuscript: October 3, 2007
Manuscript Accepted: October 3, 2007
Published: November 9, 2007

Takao Fuji and Toshinori Suzuki, "Generation of sub-two-cycle mid-infrared pulses by four-wave mixing through filamentation in air," Opt. Lett. 32, 3330-3332 (2007)

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