On the higher-order Kerr effect in femtosecond filaments

被引：41
|
作者：
Kolesik, M. [1 ]
Mirell, D. [2 ]
Diels, J. -C. [2 ]
Moloney, J. V. [1 ]
机构：
[1] Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA
[2] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA
来源：
OPTICS LETTERS | 2010年 / 35卷 / 21期
基金：
美国国家科学基金会;
关键词：
TRANSPARENT MEDIA; LASER-PULSES; LIGHT; AIR;
D O I：
10.1364/OL.35.003685
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A recent experiment probing the electronic nonlinearity in the femtosecond filament indicated that the optical Kerr effect not only saturates but even changes its sign at high intensities and thus switches from self-focusing to a strongly defocusing regime. Here we examine, through simulations and experiment, some implications of such a behavior. We perform comparative simulations based on the standard model on one hand and on a model implementing the intensity-dependent Kerr effect on the other. Comparison with an experiment provides a strong indication that of these two Kerr-effect models the standard model is better in capturing the observed length of the filament. However, neither of the models can reproduce length and filament radius. Possible implications are discussed. (C) 2010 Optical Society of America
引用
收藏
页码：3685 / 3687
页数：3
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