Resonant terahertz radiation from warm collisional inhomogeneous plasma irradiated by two Gaussian laser beams

Terahertz (THz) radiation generation by the interaction of two co-propagating high intensity laser beams with a warm collisional inhomogeneous plasma is analytically investigated. By presenting the dielectric permittivity of plasma and taking into account the ponderomotive force, the nonlinear curre...

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Veröffentlicht in:Physics of plasmas 2016-05, Vol.23 (5)
Hauptverfasser: Niknam, A. R., Banjafar, M. R., Jahangiri, F., Barzegar, S., Massudi, R.
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Sprache:eng
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Zusammenfassung:Terahertz (THz) radiation generation by the interaction of two co-propagating high intensity laser beams with a warm collisional inhomogeneous plasma is analytically investigated. By presenting the dielectric permittivity of plasma and taking into account the ponderomotive force, the nonlinear current at THz frequency is obtained. A secondary resonant enhancement of THz radiation is observed, in addition to that occurs at the plasma frequency, which can be tuned by plasma density and temperature. Moreover, we show that for each beat frequency, there exists an optimum temperature at which THz radiation is maximized. It is also shown that the power and efficiency of THz radiation decrease by increasing the collision frequency.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4949344