External static electric field assisted THz radiation generation via optical rectification of secant hyperbolic laser pulse in a plasma

In collisionless plasma, the function of an externally imposed static electric field has been investigated for facilitating the generation of high-power terahertz (THz) radiation. A nonlinear transient current density occurs at THz radiation frequency due to the optical rectification of high-power l...

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Bibliographic Details
Published in:Physics of plasmas 2024-08, Vol.31 (8)
Main Authors: Shukla, Vivek Kumar, Singh, Monika, Hussain, Saba, Singh, Ram Kishor
Format: Article
Language:English
Subjects:
Collisionless plasmas
Electric field strength
Electron plasma
High power lasers
Hyperbolic functions
Plasma frequencies
Pulse duration
Terahertz frequencies
Transient current
Wave propagation
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Summary:In collisionless plasma, the function of an externally imposed static electric field has been investigated for facilitating the generation of high-power terahertz (THz) radiation. A nonlinear transient current density occurs at THz radiation frequency due to the optical rectification of high-power laser pulse having secant hyperbolic temporal intensity profile. This transient current driving a THz radiation is found to be strongly depended on the pulse width of laser, electron plasma frequency, and externally applied electric field. The effect of mismatched phase between the generated THz wave and laser has also been studied. Numerical simulations show that the strength of THz amplitude initially increases with propagation distance and then decreases.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0223433