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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 10 — May. 9, 2011
  • pp: 9118–9126

Filamentation in air with ultrashort mid-infrared pulses

Bonggu Shim, Samuel E. Schrauth, and Alexander L. Gaeta  »View Author Affiliations

Optics Express, Vol. 19, Issue 10, pp. 9118-9126 (2011)

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We theoretically investigate filamentation of ultrashort laser pulses in air in the mid-infrared regime under conditions in which the group-velocity dispersion (GVD) is anomalous. When a high-power, ultra-short mid-infrared laser beam centered at 3.1-μm forms a filament, a spatial solitary wave is stabilized by the plasma formation and propagates several times its diffraction length. Compared with temporal self-compression in gases due to plasma formation and pulse splitting in the normal-GVD regime, the minimum achievable pulse duration (∼ 70 fs) is limited by the bandwidth of the anomalous-GVD region in air. For the relatively high powers, multiple pulse splitting due to the plasma effect and shock formation is observed, which is similar to that which occurs in solids. Our simulations show that the energy reservoir also plays a critical role for longer propagation of the air filament in the anomalous-GVD regime.

© 2011 OSA

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

ToC Category:
Ultrafast Optics

Original Manuscript: January 12, 2011
Revised Manuscript: April 4, 2011
Manuscript Accepted: April 16, 2011
Published: April 26, 2011

Bonggu Shim, Samuel E. Schrauth, and Alexander L. Gaeta, "Filamentation in air with ultrashort mid-infrared pulses," Opt. Express 19, 9118-9126 (2011)

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