Mechanism of elliptically polarized terahertz generation in two-color laser filamentation

被引：50

作者：

You, Yong Sing ^{[1
]}

Oh, Taek Il ^{[1
]}

Kim, Ki-Yong ^{[1
]}

机构：

[1] Univ Maryland, Inst Res Elect & Appl Phys, College Pk, MD 20742 USA

来源：

OPTICS LETTERS | 2013年 / 38卷 / 07期

关键词：

FEMTOSECOND FILAMENTATION; COHERENT CONTROL; AIR; PULSES; PHOTOIONIZATION; FIELDS; GAS;

D O I：

10.1364/OL.38.001034

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We investigate the mechanism of elliptically polarized terahertz (THz) pulse generation in femtosecond two-color laser-produced plasma. In the case of in-line laser focusing, we observe the THz polarization evolves from linear to elliptical with increasing plasma length. This ellipticity arises from two combined effects-successive polarization rotation of local THz plasma sources, caused by laser phase and polarization modulations, and the velocity mismatch between laser and THz, which produces an elliptical THz pulse from a series of time-delayed, polarization-rotating local THz fields. (C) 2013 Optical Society of America

引用

页码：1034 / 1036

页数：3

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