cosh-Gaussian Laser Beams Research Articles

Excitation of electrostatic lower hybrid wave by nonlinear interaction of hermite cosh-gaussian and cosh-gaussian laser beams in collisional plasma embedded with static magnetic field

Excitation of electrostatic lower hybrid wave by nonlinear interaction of hermite cosh-gaussian and cosh-gaussian laser beams in collisional plasma embedded with static magnetic field

Nonlinear absorption of Hermite cosh-Gaussian laser beam in an assembly of cylindrical carbon nanotubes embedded with static magnetic field

Nonlinear absorption of Hermite cosh-Gaussian laser beam in an assembly of cylindrical carbon nanotubes embedded with static magnetic field

Self-focusing of skew cosh gaussian laser beams propagation in absorbing collisionless and collisional plasmas

Self-focusing of skew cosh gaussian laser beams propagation in absorbing collisionless and collisional plasmas

Second harmonic generation of high power cosh-gaussian laser beam in collisional magnetized plasma

Second harmonic generation of high power cosh-gaussian laser beam in collisional magnetized plasma

Effect of mutual interaction of two cosh-Gaussian laser beams on upper hybrid wave excitation and subsequent electron acceleration

This paper presents the excitation of an upper hybrid wave by resonant excitation of two intense cosh-Gaussian laser beams of frequencies ω 1 and ω 2 in a collisionless plasma. The excited upper hybrid wave is used for electron acceleration which accelerates the electrons towards higher energy. The acceleration of electrons through an excited upper hybrid wave has also been studied. This study has been analysed using the Wentzel Kramers Brillouin (WKB) and paraxial-ray approximation, where relativistic and ponderomotive nonlinearities are employed together. Analytical expressions for the beam width/intensity of the cosh-Gaussian laser beams, the electric field/power of the excited upper hybrid wave and the electron acceleration have been derived, which have been solved numerically for an established set of laser and plasma parameters. The results are also compared to relativistic nonlinearity. It has been observed that the mutual interaction of two cosh-Gaussian laser beams at a difference frequency significantly affects the self-focusing of each beam, leading to an increase in the amplitude/power of the upper hybrid wave as well as energy gain by the electrons. The effect of the magnetic field (ωc) and decentered parameter (b) on the power of the excited upper hybrid wave and the energy gain by the electrons are also explored. The results show that the power of upper hybrid wave and the energy gain by the electrons increase at higher values ​​of b and ω c.

Third harmonic generation of cosh-Gaussian laser beam in arrays of vertically aligned carbon nanotube

Third harmonic generation of cosh-Gaussian laser beam in arrays of vertically aligned carbon nanotube

A comparative study of extraordinary and ordinary modes in the presence of external magnetic field in self-focusing of higher-order mode TEM$$_{m,n}$$ of elegant Hermite–cosh-Gaussian laser beams in collisionless plasma medium

A comparative study of extraordinary and ordinary modes in the presence of external magnetic field in self-focusing of higher-order mode TEM$$_{m,n}$$ of elegant Hermite–cosh-Gaussian laser beams in collisionless plasma medium

Propagation properties of general model vortex higher-order Cosh-Gaussian laser beam through uniaxial crystal orthogonal to the optical axis

Propagation properties of general model vortex higher-order Cosh-Gaussian laser beam through uniaxial crystal orthogonal to the optical axis

Electron accelerataion by laser driven electron plasma wave in plasma with axial density ramp: Cosh Gaussian laser beam

Electron accelerataion by laser driven electron plasma wave in plasma with axial density ramp: Cosh Gaussian laser beam

Maritime turbulence effect on the axis light intensity of a Bessel higher-order cosh-Gaussian laser beam

Maritime turbulence effect on the axis light intensity of a Bessel higher-order cosh-Gaussian laser beam

Propagation behavior of a generalized Hermite cosh-gaussian laser beam through marine environment

Propagation behavior of a generalized Hermite cosh-gaussian laser beam through marine environment

Frequency doubling on a metallic surface by Hermite–Cosh–Gaussian laser beam

Frequency doubling on a metallic surface by Hermite–Cosh–Gaussian laser beam

Study of propagation of skew cosh Gaussian laser beam in attenuated magneto plasma

Self-focusing of a laser beam is one of the major consequences of nonlinear interaction of laser with plasma. In this paper, self-focusing of skew cosh Gaussian (skew-ChG) laser beam is studied in anisotropic, collisional plasma where in externally exponentially decreasing magnetic field is applied. Skewness parameters in the field profile of skew-ChG laser beam eventually determine intensity profile of the beam. The symmetry in skewness parameter in two transverse directions simplifies the calculations considerably. Second order, nonlinear, ordinary, coupled differential equations for Beam Width Parameters (BWP) are obtained using Akhmanovs approach under Wentzel–Kramers–Brillouin (WKB) and paraxial approximations which are solved numerically. For given amplitude of applied magnetic field, attenuated oscillatory self-focusing is observed with respect to change in attenuation coefficient.

Electron Bernstein wave aided Hermite cosh-Gaussian laser beam absorption in collisional plasma

In this paper, we theoretically study the electron Bernstein wave aided Hermite-Cosh-Gaussian laser beam absorption in collisional plasma with a static magnetic field. This laser beam may have the potential to couple the pre-existing electron Bernstein wave with the coupled wave frequency and wave number where and are the electron Bernstein wave and laser beam frequencies, respectively, and and are the electron Bernstein wave and laser beam wave numbers, respectively. The plasma electron oscillatory velocities associated with the coupled wave mode produce the linear and nonlinear current density. An expression for the nonlinear absorption coefficient of an electron Bernstein wave aided Hermite cosh-Gaussian laser beam is analytically derived and more concisely discussed via different relative graphs. The graphical results promise that the absorption coefficient is strongly dependent on Hermite mode index m, beam decentered parameter d associated with the cosh term, laser beam width, laser beam frequency, electron Bernstein wave frequency, electron cyclotron frequency, electron thermal velocity and collisional frequency. Nonlinear coupling, collision phenomena and laser beam decentered parameter (very sensitive parameter) play an important role in absorption processes. The association of a very small electron Bernstein wave frequency with the laser beam causes too much of an increase in the absorption coefficient compared to only the laser beam. This efficient nonlinear absorption process may be applicable to plasma electron heating and the harmonic generation process.

Filamentation instability in the interaction of high-order Hermite cosh Gaussian laser beam and inhomogeneous plasmas

Based on high order paraxial theory and WKB approximation, filamentation instability in the interaction of high-order Hermite cosh Gaussian laser beam (HchG) and inhomogeneous plasma is studied. By changing the initial light intensity parameters and the non-uniformity of plasma density, the effect of different mode indices beams propagating in uniform and non-uniform plasmas on self-focusing filamentation structures is investigated. The results show that the HchG laser beam exhibits obvious self-focusing and filamentation phenomena along propagation distance in inhomogeneous plasma under the effect of the ponderomotive force. It is found that the mode index of HchG and plasma inhomogeneity have significant effects on filamentation instability, the higher order mode indices of HchG laser beam can strengthen filamentation instability, and plasma inhomogeneity also can enhance filamentation instability. The results provide a useful theoretical basis for effectively regulating the filamentation instability, increasing the peak laser power and designing narrower pulse width lasers.

Effect of an external magnetic field on the self-focusing of a cosh-Gaussian laser beam in plasma under the relativistic-ponderomotive effect

This work presents an analytical and numerical study of the relativistic-ponderomotive effect on self-focusing of an intense cosh-Gaussian laser beam in a collisionless magnetized plasma by considering an external magnetic field in the direction of propagation of the laser beam. The nonlinear differential equation for the beam width parameter/intensity of a cosh-Gaussian laser beam in a magnetized plasma is obtained by Wentzel–Kramers–Brillouin (WKB) and paraxial-ray approximations. The self-focusing of the cosh-Gaussian beam at different values of the magnetic field parameter is investigated. The results have also been compared to relativistic nonlinearity. The results show that the self-focusing effect of cosh-Gaussian beam in magnetized plasma becomes stronger, when relativistic and ponderomotive nonlinearities acts together. In addition, the self-trapping of cosh-Gaussian beam in magnetized plasma has also been studied. Numerical results are presented for the well-established laser and plasma parameters.

Generation of strong terahertz field by relativistic cosh-Gaussian laser beam in ripple density magnetized plasma

Generation of strong terahertz field by relativistic cosh-Gaussian laser beam in ripple density magnetized plasma

Excitation of Electron Plasma Wave by Self Focused Cosh-Gaussian Laser Beams in Collisionless Plasmas: Effect of Density Ramp

Excitation of Electron Plasma Wave by Self Focused Cosh-Gaussian Laser Beams in Collisionless Plasmas: Effect of Density Ramp

Electron Bernstein wave aided cosh-Gaussian laser beam absorption in plasma

In this paper, we investigate the electron Bernstein wave aided cosh-Gaussian laser beam absorption in a plasma with static magnetic field. The cosh-Gaussian laser beam has potential to couple with pre-existed electron Bernstein wave and the coupled wave has frequency ω1=ω0+ω and wave number k1=k0+k where ω0 and ω are the laser and electron Bernstein wave frequencies respectively and k0 and k are the wave numbers of laser and electron Bernstein wave respectively. The oscillatory velocity due to laser couples with the density perturbation due to electron Bernstein waves to produce nonlinear current density driving the electromagnetic sideband wave. An expression of absorption coefficient is analytically derived when the nonlinear current density is in phase with cosh-Gaussian laser field. The graphical discussion promises the more absorption in plasma by varying laser beam decentered parameter, beam width, laser frequency, electron cyclotron frequency, parameter b, and electron Bernstein wave frequency. The laser beam decentered parameter behaves as a very sensitive parameter. The absorption process is found to be very robust even for very small change in electron Bernstein wave frequency as compared with laser frequency. This tunable and efficient absorption theory might be applicable in heating of plasma.

Strong self-focusing of an intense cosh-Gaussian laser beam in magnetized plasma under relativistic effect

Strong self-focusing of an intense cosh-Gaussian laser beam in magnetized plasma under relativistic effect