Higher-order Kerr effect and harmonic cascading in gases

被引：22

作者：

Bache, Morten ^{[1
]}

Eilenberger, Falk ^{[2
]}

Minardi, Stefano ^{[2
]}

机构：

[1] Tech Univ Denmark, Dept Photon Engn, DTU Foton, DK-2800 Lyngby, Denmark

[2] Univ Jena, Abbe Ctr Photon, Inst Appl Phys, D-07743 Jena, Germany

来源：

OPTICS LETTERS | 2012年 / 37卷 / 22期

关键词：

FEMTOSECOND PULSES; REFRACTIVE-INDEX; MU-M; AIR; GENERATION; FILAMENTATION; COMPRESSION;

D O I：

10.1364/OL.37.004612

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The higher-order Kerr effect (HOKE) has recently been advocated to explain measurements of the saturation of the nonlinear refractive index in gases. Here we show that cascaded third-harmonic generation results in an effective fifth-order nonlinearity that is negative and significant. Higher-order harmonic cascading will also occur from the HOKE, and the cascading contributions may significantly modify the observed nonlinear index change. At lower wavelengths, cascading increases the HOKE saturation intensity, while for longer wavelengths cascading will decrease the HOKE saturation intensity. (C) 2012 Optical Society of America

引用

页码：4612 / 4614

页数：3

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