Autori: V. Tosa and C.H.Nam

Editorial: Optics Letters, 32, p.2707, 2007.

Rezumat:

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.

Cuvinte cheie: propagarea pulsurilor, filamentare // pulse propagation, filamentation