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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 10 — May. 15, 2012
  • pp: 1775–1777

Direct phase and amplitude characterization of femtosecond laser pulses undergoing filamentation in air

Johanan Odhner and Robert J. Levis  »View Author Affiliations

Optics Letters, Vol. 37, Issue 10, pp. 1775-1777 (2012)

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Measurement of the temporal (spectral) phase and amplitude of a 50 fs laser pulse approaching and exceeding the critical power for self-focusing (Pcrit) in air reveals the formation of an isolated 17 fs pulse at 3Pcrit. The dynamics of self-shortening are measured directly in the filament using transient-grating cross-correlation frequency-resolved optical gating with a noble gas serving as the nonlinear medium. Our results support recent filamentary propagation simulations, suggesting that a Kerr-dominated temporal reshaping process toward the end of the filament is largely responsible for the generation of short pulses.

© 2012 Optical Society of America

OCIS Codes
(190.3270) Nonlinear optics : Kerr effect
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

Original Manuscript: February 1, 2012
Revised Manuscript: March 14, 2012
Manuscript Accepted: March 21, 2012
Published: May 15, 2012

Johanan Odhner and Robert J. Levis, "Direct phase and amplitude characterization of femtosecond laser pulses undergoing filamentation in air," Opt. Lett. 37, 1775-1777 (2012)

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Fig. 1. Fig. 2. Fig. 3.

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