Terahertz emission profile from laser-induced air plasma

被引：157

作者：

Zhong, Hua ^{[1
]}

Karpowicz, Nick ^{[1
]}

Zhang, X. -C. ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, Ctr Terahertz Res, Troy, NY 12180 USA

来源：

APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 26期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2216025

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the characterization of the emission profile of terahertz waves generated by four-wave mixing in the presence of laser-induced plasma. Highly directional terahertz waves with a divergence angle smaller than 10 degrees are measured in the presence of long plasmas (> 10 mm). Frequency-dependent interference structures in the angular distribution of the radiation are observed under tighter focusing conditions and are explained by intense self-phase modulation of the optical pulse in the plasma. This study reveals that terahertz generation from four-wave mixing in air plasmas is a promising source for spectroscopy and imaging in the terahertz range.

引用

页数：3

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