Effect of two-color laser pulse intensity ratio on intense terahertz generation

被引：8
|
作者：
Lu, Chenhui [1 ,2 ]
Zhang, Shian [1 ]
Yao, Yunhua [1 ]
Xu, Shuwu [1 ,3 ]
Jia, Tianqing [1 ]
Ding, Jingxin [1 ]
Sun, Zhenrong [1 ]
机构：
[1] E China Normal Univ, Dept Phys, State Key Lab Precis Spect, Shanghai 200062, Peoples R China
[2] Shanghai Univ Engn Sci, Coll Mech Engn, Shanghai 201620, Peoples R China
[3] Nantong Univ, Sch Sci, Nantong 226007, Peoples R China
来源：
RSC ADVANCES | 2015年 / 5卷 / 02期
关键词：
FEMTOSECOND OPTICAL PULSES; WAVE GENERATION; IONIZATION; PLASMA; AIR; RADIATION; EMISSION; DYNAMICS; GASES;
D O I：
10.1039/c4ra12556h
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We theoretically demonstrate the effect of the intensity ratio of the two-color laser field on the terahertz generation based on a transient photocurrent model. We show that the terahertz generation depends on the intensity ratio of the two-color laser field at a given total laser intensity, and the optimal intensity ratio for the maximum terahertz generation will decrease with the increase of the total laser intensity. We also show that the final ionization degree can be used to explain the optimal intensity ratio change at different laser intensities. Furthermore, we utilize the increasing rate of electron density and the electron drift velocity to illustrate the physical mechanism of the maximum terahertz radiation generation.
引用
收藏
页码：1485 / 1490
页数：6
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