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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 18 — Sep. 15, 2007
  • pp: 2707–2708

Comment on “Direct observation of laser filamentation in high-order harmonic generation”

Valer Tosa and Chang Hee Nam  »View Author Affiliations


Optics Letters, Vol. 32, Issue 18, pp. 2707-2708 (2007)
http://dx.doi.org/10.1364/OL.32.002707


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Abstract

We argue for a different physical interpretation of the results given in the recent Letter by Painter et al. [Opt. Lett. 31, 3471 (2006)] in which an elongated Ti:saphire beam with two distinct waists is considered as direct evidence of laser filamentation. As the pulse power is well below the critical power for self-focusing, the authors pleaded for new examination of the n 2 value for He. A three-dimensional numerical modeling, using the published n 2 value for He, reproduces very well the measured data and invalidates the filamentation hypothesis.

© 2007 Optical Society of America

OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(260.5950) Physical optics : Self-focusing

ToC Category:
Nonlinear Optics

History
Original Manuscript: May 10, 2007
Manuscript Accepted: June 20, 2007
Published: September 6, 2007

Citation
Valer Tosa and Chang Hee Nam, "Comment on "Direct observation of laser filamentation in high-order harmonic generation"," Opt. Lett. 32, 2707-2708 (2007)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-18-2707

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