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 n2 value for He. A three-dimensional numerical modeling, using the published n2 value for He, reproduces very well the measured data and invalidates the filamentation hypothesis.

© 2007 Optical Society of America

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References

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  1. J. C. Painter, M. Adams, N. Brimhall, E. Christensen, G. Giraud, N. Powers, M. Turner, M. Ware, and J. Peatross, Opt. Lett. 31, 3471 (2006).
    [CrossRef] [PubMed]
  2. V. Tosa, E. Takahashi, Y. Nabekawa, and K. Midorikawa, Phys. Rev. A 67, 063817 (2003).
    [CrossRef]

2006 (1)

2003 (1)

V. Tosa, E. Takahashi, Y. Nabekawa, and K. Midorikawa, Phys. Rev. A 67, 063817 (2003).
[CrossRef]

Opt. Lett. (1)

Phys. Rev. A (1)

V. Tosa, E. Takahashi, Y. Nabekawa, and K. Midorikawa, Phys. Rev. A 67, 063817 (2003).
[CrossRef]

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Figures (1)

Fig. 1
Fig. 1

Dependence on propagation distance of the beam sizes (thick curves) and intensities (thin curves) for vacuum (solid curves) and 80   Torr of He (dashed curves).

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