Plasma mechanisms of pulsed terahertz radiation generation |
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Authors: | R A Akhmedzhanov I E Ilyakov V A Mironov E V Suvorov D A Fadeev and B V Shishkin |
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Institution: | 1.Institute of Applied Physics of the Russian Academy of Sciences,Nizhny Novgorod,Russia |
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Abstract: | We present the results on generating terahertz radiation in the plasma of an optical discharge arising in the atmosphere during
the focusing of femtosecond laser radiation. Different generation schemes related to focusing of the optical radiation by
spherical and axicon lenses, with a constant electric field imposed on the laser spark region, as well as with the use of
bichromatic laser radiation, are studied. Directivity patterns and polarization distributions of the terahertz radiation are
analyzed in detail for different generation techniques. Comparison with the experimental results obtained by other research
groups is given. Possible nonlinear mechanisms of the terahertz radiation generation are discussed. |
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