NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2015, Vol.18, No.2, pp.157-163


Control of THz Radiation from Gaseous Plasmas Produced by Intense Optical Fields
I. Babushkin, A. Husakou

Ultrashort terahertz pulses can be produced via frequency conversion from strong femtosecond two- and multi-color pulses focused in a noble gas. The mechanism is based on the nonlinearity produced by tunnel ionization of gas atoms. In this article the new possibilities to control the characteristics of the resulting THz pulses such as wave shape, and intensity by engineering the pump waveshape are discussed. The so-called saw-tooth pump shape is demonstrated to optimize electron velocities affecting the resulting THz emission.


Key words: terahertz generation, ultrashort terahertz pulses, photoionization by intense femtosecond pulses, tunnel ionization

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