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12 September 2019 Multi-beam plasma generation of high-field terahertz radiation (Conference Presentation)
Jeremy A. Johnson
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Proceedings Volume 11124, Terahertz Emitters, Receivers, and Applications X; 111240A (2019) https://doi.org/10.1117/12.2529867
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States
Abstract
Plasma-based generation schemes of terahertz (THz) are promising and flexible sources of high-field, broadband THz pulses. The traditional plasma-generation scheme involves combining an ultrafast laser pulse with its second harmonic in a tight focus to generate a plasma from which THz radiation is emitted. We demonstrate non-traditional experimental schemes for plasma-based THz generation using multiple laser pulses. THz emission of a plasma formed by a commensurate two-color pulse (containing a near IR frequency and its second harmonic) can be enhanced by the addition of an 800-nm pulse, which is the waste light from an optical parametric amplifier. We observed enhancements of the THz electric field by a factor of up to 30. Numerical calculations done using the well-known photocurrent model are in good agreement with experimental results. These studies help suggest future avenues of improvement in practical table-top plasma generation of THz.
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Jeremy A. Johnson "Multi-beam plasma generation of high-field terahertz radiation (Conference Presentation)", Proc. SPIE 11124, Terahertz Emitters, Receivers, and Applications X, 111240A (12 September 2019); https://doi.org/10.1117/12.2529867
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KEYWORDS
Terahertz radiation
Plasma generation
Plasma
Optical amplifiers
Ultrafast lasers
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