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

In this paper, we have developed a theoretical formalism to investigate the nonlinear absorption of high-power Hermite cosh-Gaussian laser beam in arrays of cylindrical carbon nanotubes in the presence of an external static magnetic field. As the incident Hermite cosh-Gaussian laser beam interacts with the carbon nanotubes, the atoms associated with this medium get excited and became ionized resulting to form the preformed plasma. The field of laser beam radiation causes to displace the electrons cylinder with respect to ion cylinder. Due to the displacement of electron cylinder, an electrostatic restoration force will be taken in to consideration and this causes the nonlinearity. An analytic expression of effective nonlinear absorption coefficient of Hermite cosh-Gaussian laser beam is calculated. The maximum nonlinear effective absorption is achieved as the laser beam frequency approaches near the 1 / 2 times the electron plasmon frequency. The absorption process of laser beam on the surface of carbon nanotube enhanced in the presence of static magnetic field. The absorption of laser beam is strongly dependent on various parameters such as electron cyclotron frequency, decentered parameter, electron–ion collisional frequency, transverse propagation distance, laser mode index, and beam width parameter. This tunable and enhanced laser beam absorption on the surface of carbon nanotube might be applicable in electron heating and high harmonic generation.