Systematic study of terahertz wave generation in laser-included plasma

Ji Zhao; LiangLiang Zhang; YiMan Luo; Tong Wu; CunLin Zhang; YueJin Zhao

doi:10.1117/12.2192938

12 August 2015 Systematic study of terahertz wave generation in laser-included plasma

Ji Zhao, LiangLiang Zhang, YiMan Luo, Tong Wu, CunLin Zhang, YueJin Zhao

Proceedings Volume 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications; 962508 (2015) https://doi.org/10.1117/12.2192938
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

THz wave generation in laser-included plasma has attracted considerable attention recently and the intense THz waves generated from air-induced plasma, serving as broadband THz source for sensing and imaging applications, has attracted more and more researchers’ interests in recent years. In our experiment, terahertz is detected using THz Air-Biased Coherent Detection (THz-ABCD) method. This method can achieve the third-order nonlinear susceptibility tensor to produce field-induced optical second harmonic photons. In the THz-ABCD system, red-shift is observed in frequency spectra with enhanced pump power and decreased bandwidth. After changing the probe power, the red-shift in frequency spectral can also observed with enhanced probe power, but the bandwidth is broadening as the prober power increasing. We further explore of these phenomena through intense self-phase modulation of the optical pulse in the plasma and the collision behavior. This study reveals that we can control THz intensity and bandwidth by changing pump power and probe power in the ABCD system.

Citation Download Citation

Ji Zhao, LiangLiang Zhang, YiMan Luo, Tong Wu, CunLin Zhang, and YueJin Zhao "Systematic study of terahertz wave generation in laser-included plasma", Proc. SPIE 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications, 962508 (12 August 2015); https://doi.org/10.1117/12.2192938

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