Terahertz Emission Dependence on the Fundamental Optical Intensity in Generating Terahertz Waves from Two-Color Laser-Induced Gas Plasma

被引：3
|
作者：
Dai Hou-Mei [1 ,2 ]
Liu Jin-Song [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Sch Optoelect Sci & Engn, Wuhan 430074, Peoples R China
[2] Wuhan Univ Sci & Technol, Hubei Prov Key Lab Syst Sci Met Proc, Wuhan 430081, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2011年 / 28卷 / 10期
基金：
中国国家自然科学基金;
关键词：
PRESSURE-DEPENDENCE; FIELD IONIZATION; PULSE GENERATION; AIR; PHOTOIONIZATION;
D O I：
10.1088/0256-307X/28/10/104201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A transient photocurrent model is used to explain terahertz emission from gas plasma irritated by two-color laser pulses, with one the second harmonic of the other. Taking multiple degrees of ionization into account, the gas ionization process at different laser intensities from 10(14) W/cm(2) to 10(15) W/cm(2) is discussed. The results show that when I-w = 6 x 10(14) W/cm(2), double ionization plays an important role in producing electrons. The corresponding terahertz spectra and waveforms are calculated, showing that increasing laser intensity can broaden the spectra to high frequencies and enhance the terahertz field.
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页数：3
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