Effect of self-focusing on laser third harmonic generation in a clustered gas

Parashar, J.

doi:10.1088/0031-8949/79/01/015501

Cited by 14 publications

(7 citation statements)

References 27 publications

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“…Tiwari and Tripathi [33] have reported that much enhancement in third harmonic generation can be achieved when one has taken clustered radius 1.7 times than its initial radius. Parashar et al [34] proposed a theory of third harmonic generation in cluster plasma by Gaussian laser beam under paraxial ray approximation. It is found that self-focusing plays an important tool for efficient harmonic generation when cluster density is three times to its critical density.…”

Section: Introductionmentioning

confidence: 99%

Electron Bernstein wave aided heating of collisional nanocluster plasma by nonlinear interactions of two super-Gaussian laser beams

Varma¹,

Kumar²

2021

Laser Phys.

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In this present theoretical study, we investigate electron Bernstein wave (EBW) aided collisional nanocluster plasma heating by nonlinear interaction of two super-Gaussian laser beams. The interactions of laser beams electric field profiles with electronic clouds of nanoclusters cause the beat wave. The nonlinear ponderomotive force is generated through the beat wave. There may be good potential to excite the EBW aiding cluster plasma to lead electron heating via cyclotron damping of the Bernstein wave. An analytical scheme is proposed for the anomalous heating and evolution of electron temperature by using this mechanism. Graphical discussions were promised to achieve extreme heating rate via the spatial shape of super-Gaussian laser beams and the resonance condition of beat wave to surface plasmon frequency. The heating is controlled by tuning the laser beam width, mode index, collisional frequency, clustered radius, and density.

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Section: Introductionmentioning

confidence: 99%

Electron Bernstein wave aided heating of collisional nanocluster plasma by nonlinear interactions of two super-Gaussian laser beams

Varma¹,

Kumar²

2021

Laser Phys.

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“…Many efforts are being made by various researchers to investigate the interaction of a laser beam with clusters [24][25][26][27]. Tiwari and Tripathi [24] presented a study of third order harmonic generation from an exploding cluster.…”

Section: Introductionmentioning

confidence: 99%

“…They demonstrated that an increase in the ratio of nanoparticles' radii to their separation, and also enhancement in the maximum amplitude, lead to the localization of the laser beam transversely. Another analytical investigation of the self-focusing of a Gaussian laser beam propagating through a gas embedded with atomic clusters was presented by Parashar [26]. Vij [27] studied wiggler magnetic field assisted third harmonic generation of an intense short pulse laser in a cluster in its expanding phase.…”

Section: Introductionmentioning

confidence: 99%

Effects of the helical magnetic wiggler on a laser beam interacting with a lattice of metallic nanoparticles: plasmonic and body waves

Siahmazgi

Jafari

2019

Laser Phys. Lett.

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In this study, the influence of a helical magnetic wiggler on the nonlinear interaction of a laser beam with a lattice of metallic nanoparticles is investigated. Coupling of the static magnetic field of the wiggler to the field of the laser wave, and therefore a change in the electric field intensity of the pumped wave, leads to the formation of a nonlinear force in the interaction region. As a consequence, the nonlinear force enhances the plasmonic oscillations of the electronic cloud of each nanoparticle causing electron density modulation, which improves the self-focusing property of the laser beam. Using a perturbative method, the nonlinear dispersion plasmonic and body waves are obtained from the interaction of a laser beam with a lattice of nanoparticles in the presence of a helical magnetic wiggler. We investigate the effects of nanoparticle size, their separations and wiggler field strength on the evolution of the transverse profile of the laser beam in both incident linearly polarized and circularly polarized waves. The numerical results indicate that in the linear polarization for all branches of plasmonic and body waves (except for the low-frequency middle branch), laser bandwidth decreases with increasing nanoparticle separation length, which improves the self-focusing property. Moreover, with enhancement of the normalized wiggler field strength, the laser amplitude transverse profile for all branches of plasmonic and body waves (except for the low-frequency middle branch) decreases, which leads to beam focusing. For left and right circular polarization, it is found that with an increase in the nanoparticle separation length, the laser amplitude transverse profile for all branches of plasmonic and body waves (except for the low-frequency middle branch) increases, which leads to beam defocusing. Furthermore, with enhancement of the normalized wiggler field strength, the laser amplitude transverse profile decreases for body waves and the low-frequency lower branch of plasmonic waves, which gives rise to the beam focusing, whereas it increases for the low-frequency middle and upper branches of plasmonic waves, which leads to the beam defocusing.

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“…[1][2][3][4][5][6][7] It is observed that harmonic yield is significantly enhanced in the presence of surface roughness or nanostructures. [8][9][10][11][12][13][14] This enhancement is attributed to laser mode conversion into surface plasma wave (SPW), an electromagnetic mode, propagating close to metaldielectric interface with sharp decay of amplitude in both mediums away from the interface.…”

Section: Introductionmentioning

confidence: 99%

Surface plasma wave assisted second harmonic generation of laser over a metal film

Chauhan¹,

Parashar²

2015

Physics of Plasmas

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Second harmonic generation of laser mode converted surface plasma wave (SPW) over a corrugated metal film is studied. The laser, impinged on the metal film, under attenuated total reflection configuration, excites SPW over the metal-vacuum interface. The excited SPW extends over a much wider surface area than the laser spot cross-section. It exerts a second harmonic ponderomotive force on metal electrons, imparting them velocity that beats with the surface ripple to produce a nonlinear current, driving resonant second harmonic surface plasma wave. V C 2015 AIP Publishing LLC. [http://dx.

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Effect of self-focusing on laser third harmonic generation in a clustered gas

Cited by 14 publications

References 27 publications

Electron Bernstein wave aided heating of collisional nanocluster plasma by nonlinear interactions of two super-Gaussian laser beams

Electron Bernstein wave aided heating of collisional nanocluster plasma by nonlinear interactions of two super-Gaussian laser beams

Effects of the helical magnetic wiggler on a laser beam interacting with a lattice of metallic nanoparticles: plasmonic and body waves

Surface plasma wave assisted second harmonic generation of laser over a metal film

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