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

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...

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Bibliographic Details
Published in:RSC advances 2015-01, Vol.5 (2), p.1485-149
Main Authors: Lu, Chenhui, Zhang, Shian, Yao, Yunhua, Xu, Shuwu, Jia, Tianqing, Ding, Jingxin, Sun, Zhenrong
Format: Article
Language:English
Subjects:
Electron density
Electron drift velocity
Ionization
Lasers
Optimization
Photocurrent
Photoelectric effect
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Summary: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. 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.
ISSN:2046-2069
2046-2069
DOI:10.1039/c4ra12556h