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Characterization of THz wave generated from air plasma induced by two-color laser with long wavelength
Author(s): Shijing Zhang; LiangLiang Zhang; Tong Wu; Hang Zhao; Xiaomei Yu; Cunlin Zhang; Yuejin Zhao
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Paper Abstract

Terahertz (THz) wave generation from laser induced air plasma is widely used due to its high electric field and broad frequency bandwidth. The most popular and efficient laser-plasma scheme used for THz generation is the two-color scheme, in which a laser pulse at the fundamental frequency is supplemented by its second harmonic that is obtained with the use of a nonlinear crystal. The type-I β-barium borate (BBO) crystal plays a very important role in second harmonic generation. In this research, we investigate the THz generation efficiency with changing the thicknesses of the BBO crystals. Moreover, the wavelength of the excitation laser is tunable from 1200 nm to 1600 nm. The THz generation efficiency is characterized by rotating the BBO crystal with the same tilt angle, changing laser wavelength with invariant pump power. And we also record the two orthogonal components of THz electric field by rotating the ZnTe crystal. We think that the thickness of BBO crystal affects the phase difference between the two components along the ordinary axis and extraordinary axis, resulting in the change of the polarization state of the fundamental wave. Meanwhile, the frequency doubling efficiency of BBO has an impact on the power ratio of the two-color laser. This provides a practical way to control the polarization of THz pulses for potential applications.

Paper Details

Date Published: 23 August 2017
PDF: 5 pages
Proc. SPIE 10383, Terahertz Emitters, Receivers, and Applications VIII, 103830E (23 August 2017); doi: 10.1117/12.2272647
Show Author Affiliations
Shijing Zhang, Beijing Institute of Technology (China)
LiangLiang Zhang, Capital Normal Univ. (China)
Tong Wu, Beijing Institute of Technology (China)
Hang Zhao, Capital Normal Univ. (China)
Xiaomei Yu, Peking Univ. (China)
Cunlin Zhang, Capital Normal Univ. (China)
Yuejin Zhao, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 10383:
Terahertz Emitters, Receivers, and Applications VIII
Manijeh Razeghi; Alexei N. Baranov; Dimitris Pavlidis; John M. Zavada, Editor(s)

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