Second harmonic generation of cosh-Gaussian laser beam in magnetized plasma

Sharma, Vinay; Thakur, Vishal; Kant, Niti

doi:10.1007/s11082-020-02559-3

Cited by 29 publications

(6 citation statements)

References 17 publications

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“…Similarly in our work, we have seen better enhancement in the amplitude of second harmonic for Cu. Sharma et al [22] studied SHG of cosh-Gaussian laser beam in magnetized plasma and found enhancement in efficiency in the presence of wiggler field.…”

Section: Resultsmentioning

confidence: 99%

Second Harmonic Generation Induced by a Surface Plasma Wave on a Metallic Surface in the Presence of a Wiggler Magnetic Field

2022

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Under the influence of wiggler magnetic field, the phenomenon of second harmonic generation at the metal-semiconductor interface, induced by surface plasma wave (SPW) has been investigated. Metals like Cu, Ag and Al, each with a thin layer of n-InSb over it, are considered for our study.Laser light is incident on metal layered on glass prism in attenuated total reflection Kretschmann configuration (ATR) which generates SPW. The SPW further interacts nonlinearly with the electrons of n-type semiconductor layered over the metal, leading to second harmonic generation (SHG). The presence of an external wiggler magnetic field makes the process resonant and helps in phase matching. Relatively more enhancement in the amplitude of the second harmonic is observed for Cu-InSb as compared to Ag-InSb and Al-InSb. Numerical analysis shows that the enhancement in the amplitude of SHG increases with the wiggler magnetic field.

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Section: Resultsmentioning

confidence: 99%

Second Harmonic Generation Induced by a Surface Plasma Wave on a Metallic Surface in the Presence of a Wiggler Magnetic Field

2022

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“…They obtained the expression using WKG approximation, and stronger self-focusing was reported. Sharma et al [12] studied the cosh-Gaussian laser beam for SHG. Using paraxial approximation, they derived an expression for the normalized amplitude of the second-harmonic pulse.…”

Section: Introductionmentioning

confidence: 99%

Resonant second-harmonic generation of self-focused oblique incident laser beam in plasma

Sharma,

Thakur,

Srivastava

et al. 2024

Laser Phys.

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The present manuscript aims to realize the effect of self-focusing on second-harmonic generation (SHG) by oblique incident laser beams in plasma. When an intense laser beam is obliquely incident on the plasma, it is resolved into reflected and refracted components, and resonant SHG is produced in the reflected component on account of the self-focusing of the incident laser. With the help of paraxial approximation, we have obtained a mathematical expression for the beam width parameter and for the normalized amplitude of the second harmonic. It has been observed that the amplitude of the second-harmonic pulse is significantly influenced by the intensity of the incident laser beam, the wiggler magnetic field, and the normalized plasma frequency. The analysis was performed for different values of the angle of incidence and laser parameters. The results show stronger self-focusing and, hence, efficient SHG when the angle of incidence is the critical angle.

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“…Laser–plasma interaction has led to many developments in terahertz generation (Sobhani, Dadar & Feili 2017; Sun, Wang & Zhang 2022), second-harmonic generation (Upadhyay & Tripathi 2005; Sharma, Thakur & Kant 2020), plasma-wakefield excitation for particle acceleration (Kim et al 2021; Kad & Singh 2022 b ), etc. Plasma being a nonlinear medium has an extraordinarily high damage threshold, and is thus capable of sustaining a high-intensity electric field (Hassan et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Generation of terahertz radiation by a Hermite–Gaussian laser beam inside magnetoplasma with a density ramp

2023

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In the present scheme of work, the Hermite–Gaussian (HG) laser beam dynamics has been investigated under the influence of an upward density ramp inside magnetized plasma, where both relativistic and ponderomotive nonlinearities are operative. One can achieve self-focusing of laser beam due to the change in the medium's dielectric function, which comes into operation due to the expulsion of plasma electrons from the high intensity to the low-intensity region by ponderomotive force and their motion at relativistic speeds. The dynamics of the laser beam and terahertz generation have been investigated by using the moment theory approach. It has been observed from the present analysis that the dynamics of the laser beam and the production of terahertz radiations strongly depends upon the HG laser beam and plasma parameters. In addition to this, the effect of density ramp and magnetic field has also been investigated on the efficiency of terahertz generation. It has been observed that higher-order modes of the HG laser beam play a dominant role in the production of terahertz radiations.

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Second harmonic generation of cosh-Gaussian laser beam in magnetized plasma

Cited by 29 publications

References 17 publications

Second Harmonic Generation Induced by a Surface Plasma Wave on a Metallic Surface in the Presence of a Wiggler Magnetic Field

Second Harmonic Generation Induced by a Surface Plasma Wave on a Metallic Surface in the Presence of a Wiggler Magnetic Field

Resonant second-harmonic generation of self-focused oblique incident laser beam in plasma

Generation of terahertz radiation by a Hermite–Gaussian laser beam inside magnetoplasma with a density ramp

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