Terahertz radiation generation driven by the frequency chirped laser pulse in magneto-active plasma

Mehta, Alka; Kant, Niti

doi:10.1117/12.2505928

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…In order to overcome these concerns, plasma acts as an appropriate medium which overcomes the material damage related problems in the case of THz generation. Several techniques have been proposed experimentally [6][7][8] and theoretically [9][10][11][12][13][14] for efficient THz generation by employing plasma as a medium. Kwon et al [15] have reported highly energetic, short duration bursts of coherent THz radiation from an embedded plasma dipole.…”

Section: Introductionmentioning

confidence: 99%

Terahertz generation by beating of two chirped pulse lasers in spatially periodic density plasma

et al. 2020

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The present paper reports on the combined influence of the chirp characteristics of pump pulses and spatially periodic density (density ripple) plasma, on terahertz (THz) radiation generation, by beating of two chirped pulses. The beating lasers exert a nonlinear ponderomotive force along the z-direction. A self-consistent field is generated due to the nonlinear oscillations of plasma electrons; as a result of these linear and nonlinear forces the plasma electrons attain an oscillatory velocity that couples with the density ripple to generate a stronger transient transverse current, driving THz radiation. The importance of chirp parameter, amplitude and periodicity of density structure are discussed for emitted THz radiation. Our numerical simulations disclose that the variation of the chirp frequency parameter and ripple amplitude have considerable roles in improving the nonlinear oscillating current. By optimizing the chirp parameter and amplitude of the density ripple, a notable change in the magnitude of the terahertz field amplitude is found. The present paper maybe useful for broadband THz pulses, for use in plasma diagnostics and time-domain spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Terahertz generation by beating of two chirped pulse lasers in spatially periodic density plasma

et al. 2020

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“…Hence, the alternative to avoid this issue is to employ a nonlinear medium, which can endure highpeak ultrashort laser power. In this context, several schemes and models have been proposed and realized [7][8][9][10][11]. Plasma emerges as a potential alternative medium for the same technique and can withstand high power due to ultrashort laser pulses.…”

Section: Introductionmentioning

confidence: 99%

Effect of frequency-chirped laser pulses on terahertz radiation generation in magnetized plasma

2019

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The effect of frequency chirp on the generated terahertz (THz) wave by the interaction between intense laser pulses and under dense plasma in the presence of transverse magnetic field is investigated theoretically in the present model. An expression for the electron Lorentz factor coupling cyclotron motion nonlinearity is derived for static magnetic field perpendicular to the laser propagation axis. The beating lasers produce a nonlinear ponderomotive force due to their oscillatory motion. This force drives a nonlinear current, at beat frequency, which produces the THz radiation. The influence of the external magnetic field on the optimization process of THz field amplitude is investigated numerically. A linear frequency chirp increases the duration of nonlinear interaction of laser pulse with plasma electrons and hence, enforces the interaction for longer duration. The presence of magnetic field further provides the additional momentum to the THz photon to obtain a significant gain in output yield. Our numerical simulations reveal that there is a significant enhancement in the THz field strength for optimized value of the chirp parameter and magnetic field.

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Enhanced THz generation by Hermite-cosh-Gaussian chirped laser in static magnetized plasma

Midha,

Sharma,

Kant

et al. 2024

Appl. Phys. B

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Terahertz radiation generation driven by the frequency chirped laser pulse in magneto-active plasma

Cited by 5 publications

References 6 publications

Terahertz generation by beating of two chirped pulse lasers in spatially periodic density plasma

Terahertz generation by beating of two chirped pulse lasers in spatially periodic density plasma

Effect of frequency-chirped laser pulses on terahertz radiation generation in magnetized plasma

Enhanced THz generation by Hermite-cosh-Gaussian chirped laser in static magnetized plasma

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