31 August 2015 Intense terahertz-pulse generation by four-wave mixing process in induced gas plasma
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In this article, we have numerically investigated an intense terahertz (THz) pulses generation in gaseous plasma based on the third-order nonlinear effect, four-wave mixing rectification (FWMR). We have proposed that the fundamental fields and second-harmonic field of ultra-short pulse lasers are combined and focused into a very small gas chamber to induce a gaseous plasma, which intense THz pulse is produced. To understand the THz generation process, the first-order multiple-scale perturbation method (MSPM) has been utilized to derive a set of nonlinear coupled-mode equations for interacting fields such as two fundamental fields, a second-harmonic field, and a THz field. Then, we have simulate the intense THz-pulse generation by using split step-beam propagation method (SS-BPM) and calculated output THz intensities. Finally, the output THz intensities generated from induced air, nitrogen, and argon plasma have been compared.
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S. Wicharn, S. Wicharn, P. Buranasiri, P. Buranasiri, } "Intense terahertz-pulse generation by four-wave mixing process in induced gas plasma", Proc. SPIE 9546, Active Photonic Materials VII, 954621 (31 August 2015); doi: 10.1117/12.2186931; https://doi.org/10.1117/12.2186931

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