On the Peculiarities of THz Radiation Generation in a Laser Induced Plasmas

Experimental data on terahertz generation from laser spark created by linearly polarized femtosecond pulses focused by spherical lenses are presented. Specific features of generated terahertz radiation registered in the latest experiments for the case of monochromatic laser pulse definitely demonstr...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2011-10, Vol.32 (10), p.1243-1252
Main Authors: Suvorov, Evgeny, Akhmedzhanov, Rinat, Fadeev, Daniil, Ilyakov, Igor, Mironov, Vyacheslav, Shishkin, Boris
Format: Article
Language:English
Subjects:
Classical Electrodynamics
Deviation
Direct current
Distribution functions
Electric fields
Electrical Engineering
Electron distribution
Electronics and Microelectronics
Engineering
Femtosecond pulses
Gas breakdown
Infrared
Instrumentation
Ionization
Laser plasmas
Lasers
Linear polarization
Mathematical models
Plasmas
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Summary:Experimental data on terahertz generation from laser spark created by linearly polarized femtosecond pulses focused by spherical lenses are presented. Specific features of generated terahertz radiation registered in the latest experiments for the case of monochromatic laser pulse definitely demonstrate severe deviation from the axial symmetry, which results from conventionally used model for low-frequency current excitation in a laser spark due to the ponderomotive action from fs laser pulse. The new approach to the theoretical interpretation basing on kinetic description for electron distribution function has been developed with taking into account peculiarities of the tunnel ionization under the action of linearly polarized laser field. A simple generalization of developed model for the case of applying external dc electric field to the region of gas breakdown allowed to describe the modification of terahertz radiation pattern depending on the value of external dc field.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-011-9817-2