1. Physics of the conical broadband terahertz emission from two-color laser-induced plasma filaments.
- Author
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Gorodetsky, Andrei, Koulouklidis, Anastasios D., Massaouti, Maria, and Tzortzakis, Stelios
- Subjects
- *
LASER plasmas , *PLASMA density , *PLASMA physics , *RADIATION , *LASER pulses - Abstract
We propose a comprehensive physical model explaining the conical character of broadband terahertz generation from femtosecond two-color laser-induced air plasma filaments. We show, that, in contrast to other models, emission is always conical, resulting from phase matching of the radiation produced inside the filament combined with a partial back reflection of the generated terahertz field from the filament itself due to the frequency-dependent critical plasma density. The obtained conical angle varies from 2° to 10°, depending on the plasma density distribution and filament length. Unlike previously proposed models, our model shows good agreement with our experiments as well as a wide range of experimental findings from the literature. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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