Measurement of nonlinear refractive index and ionization rates in air using a wavefront sensor

被引：22
|
作者：
Schwarz, Jens [1 ]
Rambo, Patrick [1 ]
Kimmel, Mark [1 ]
Atherton, Briggs [1 ]
机构：
[1] Sandia Natl Labs, Albuquerque, NM 87123 USA
来源：
OPTICS EXPRESS | 2012年 / 20卷 / 08期
基金：
美国能源部;
关键词：
FEMTOSECOND LASER-PULSES; TRANSPARENT MEDIA; FILAMENTATION; O-2; INTENSITY; DISTANCE; LIGHT; POWER; N-2;
D O I：
10.1364/OE.20.008791
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A wavefront sensor has been used to measure the Kerr nonlinear focal shift of a high intensity ultrashort pulse beam in a focusing beam geometry while accounting for the effects of plasma-defocusing. It is shown that plasma-defocusing plays a major role in the nonlinear focusing dynamics and that measurements of Kerr nonlinearity and ionization are coupled. Furthermore, this coupled effect leads to a novel way that measures the laser ionization rates in air under atmospheric conditions as well as Kerr nonlinearity. The measured nonlinear index n(2) compares well with values found in the literature and the measured ionization rates could be successfully benchmarked to the model developed by Perelomov, Popov, and Terentev (PPT model) [Sov. Phys. JETP 50, 1393 (1966)]. (C) 2012 Optical Society of America
引用
收藏
页码：8791 / 8803
页数：13
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