THz radiation by amplitude-modulated self-focused Gaussian laser beam in ripple density plasma

Kumar, Subodh; Singh, R. N.; Singh, Monika; Sharma, R. P.

doi:10.1017/s026303461500035x

Cited by 18 publications

(9 citation statements)

References 52 publications

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“…Figure 6, also explains the importance of modulation index, for the enhancement of normalized THz amplitude. Such dependence has also been explained by Kumar et al [33] in their theoretical study THz generation by amplitude-modulated laser beam in ripple density plasma. So, the output of THz wave generation can be tuned by using appropriate values of the applied static magnetic field strength and modulation index.…”

Section: The Length Of Eachsupporting

confidence: 63%

Efficient THz Generation by Nonlinear Interaction of Gaussian Laser Beam With the Anharmonic and Rippled CNTs Aligned Vertically in the Array

Kumar

Vij

Kant

et al. 2021

Preprint

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We purpose a theoretical analysis for the generation of efficient terahertz (THz) radiation by using the nonlinear interaction of Gaussian laser beam with vertically aligned anharmonic, and rippled carbon nanotubes (CNTs) array. This array of vertically aligned carbon nanotubes (VA-CNTs) is embedded on the base of the dielectric surface. The VA-CNTs have been magnetized by applying a static magnetic field mutually perpendicular to the direction of propagation of the Gaussian beam and length of CNTs. The Gaussian laser beam passing through the CNTs exerts a nonlinear ponderomotive force on the electrons of CNTs and provides them resonant nonlinear transverse velocity. This produces the nonlinear current which is further responsible for the generation of THz radiation. The anharmonicity plays a vital role in the efficient generation of THz radiation. The anharmonicity arises due to the nonlinear variation of restoration force on the various electrons of CNTs. This anharmonicity in the electrons of CNTs helps in broadening the resonance peak. We have observed that externally applied static magnetic field 110 kg to 330 kg) also paves the way for the enhancement of the normalized THz amplitude.

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Section: The Length Of Eachsupporting

confidence: 63%

Efficient THz Generation by Nonlinear Interaction of Gaussian Laser Beam With the Anharmonic and Rippled CNTs Aligned Vertically in the Array

Kumar

Vij

Kant

et al. 2021

Preprint

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“…In addition, various models have been developed for THz radiation generation by the interaction of high‐intensity laser beams with a preformed plasma . In a preformed plasma, two co‐propagating laser beams exert a nonlinear ponderomotive force on the electrons at the beat wave frequency ,.…”

Section: Introductionmentioning

confidence: 99%

Generation of electromagnetic waves in the terahertz frequency range by optical rectification of a Gaussian laser pulse in a plasma in presence of an externally applied static electric field

Singh

Kumar

Sharma

2017

Contrib. Plasma Phys

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We propose a theoretical model for the generation of electromagnetic waves in the terahertz (THz) frequency range by the optical rectification of a Gaussian laser pulse in a plasma with an applied static electric field transverse to the direction of propagation. A Gaussian laser pulse can exert a transverse component of the quasi‐static ponderomotive force on the electrons at a frequency in the THz range by a suitable choice of the laser pulse width. This nonlinear force is responsible for the density oscillation. The coupling of this oscillation with the drift velocity acquired by electrons due to the applied static electric field leads to the generation of a nonlinear current density. A spatial Gaussian intensity profile of the laser beam enhances the generated THz yield by many folds as compared to a uniform spatial intensity profile.

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“…Terahertz generation by amplitude-modulated self-focused Gaussian laser beam in ripple density plasma has also been studied in Ref. [37]. In this system, a current is generated by transverse component of ponderomotive force on electrons as a result the radiation is being driven at the modulation frequency (taken into terahertz domain).…”

Section: Beat Wave Schemesmentioning

confidence: 99%

“…Kumar et al [41] numerically investigated that THz yield increases sufficiently under the effect of self-focusing and defocusing of amplitude-modulated Gaussian laser beam in rippled density plasma. Hong et al [42] studied the propagation of a Gaussian and hollow Gaussian laser beam in a tapered plasma to figure out the ponderomotive self-channeling and relativistic self-focusing effects.…”

Section: Beat Wave Schemesmentioning

confidence: 99%

Studies of Terahertz Sources and Their Applications

Singh¹,

Meena²,

Tyagi³

et al. 2022

Intelligent Electronics and Circuits - Terahertz, ITS, and Beyond

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The contributed chapter discuss the applications of terahertz radiations and its generation mechanism through laser plasma interactions. The methods of generation of terahertz radiations from plasma wake field acceleration, higher harmonic generation and the laser beat wave plasma frequency are reviewed. The nonlinear current density oscillate the plasma at beat wave frequency under the effect of ponderomotive force and excite the terahertz radiation at beat wave frequency. The current state of the arts of the methods of generation has been incorporated. The mathematical expression of ponderomotive force has been derived under the influence of gradient of laser fields. In additions, the future challenge and their overcomes are also been discussed.

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THz radiation by amplitude-modulated self-focused Gaussian laser beam in ripple density plasma

Cited by 18 publications

References 52 publications

Efficient THz Generation by Nonlinear Interaction of Gaussian Laser Beam With the Anharmonic and Rippled CNTs Aligned Vertically in the Array

Efficient THz Generation by Nonlinear Interaction of Gaussian Laser Beam With the Anharmonic and Rippled CNTs Aligned Vertically in the Array

Generation of electromagnetic waves in the terahertz frequency range by optical rectification of a Gaussian laser pulse in a plasma in presence of an externally applied static electric field

Studies of Terahertz Sources and Their Applications

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