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Proceedings Paper

Study on THz wave generation from air plasma induced by quasi-square Airy beam
Author(s): Shijing Zhang; Liangliang Zhang; Guangtong Jiang; Cunlin Zhang; Yuejin Zhao
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Paper Abstract

Terahertz (THz) wave has attracted considerable attention in recent years because of its potential applications. The intense THz waves generated from air plasma induced by two-color femtosecond laser are widely used due to its high generation efficiency and broad frequency bandwidth. The parameters of the laser change the distribution of the air plasma, and then affect the generation of THz wave. In this research, we investigate the THz wave generation from air plasma induced by quasi-square Airy beam. Unlike the common Gauss beam, the quasi-square Airy beam has ability to autofocus and to increase the maximum intensity at the focus. By using the spatial light modulator (SLM), we can change the parameters of phase map to control the shape of the Airy beam. We obtain the two-color laser field by a 100-um-thick BBO crystal, then use a Golay detector to record THz wave energy. By comparing terahertz generation at different modulation depths, we find that terahertz energy produced by quasi-square Airy beam is up to 3.1 times stronger than that of Gauss beam with identical laser energy. In order to understand the influence of quasi-square Airy beam on the BBO crystal, we record THz wave energy by changing the azimuthal angle of BBO crystal with Gauss beam and Airy beam at different modulation depths. We find that the trend of terahertz energy with respect to the azimuthal angle of the BBO crystal keeps the same for different laser beams. We believe that the quasi-square Airy beam or other auto focusing beam can significantly improve the efficiency of terahertz wave generation and pave the way for its applications.

Paper Details

Date Published: 12 January 2018
PDF: 6 pages
Proc. SPIE 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications, 106230R (12 January 2018); doi: 10.1117/12.2300546
Show Author Affiliations
Shijing Zhang, Beijing Institute of Technology (China)
Liangliang Zhang, Capital Normal Univ. (China)
Guangtong Jiang, Capital Normal Univ. (China)
Cunlin Zhang, Capital Normal Univ. (China)
Yuejin Zhao, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 10623:
2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications
Cunlin Zhang; Xi-Cheng Zhang; Zhiming Huang; Liquan Dong, Editor(s)

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