Focusing of an intense Gaussian laser beam in a radially inhomogeneous medium

Prakash, Gyan; Sharma, Ashutosh; Verma, Manisha; Sodha, M. S.

doi:10.1364/josab.22.001268

Cited by 24 publications

(6 citation statements)

References 15 publications

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“…The complex interaction of high-power laser with plasma has become a popular research topic due to its various applications in science and technology, including laser-driven inertial confined fusion (ICF) [1], laser-driven accelerators [2] and laser machining [3]. The main research areas have focused on the propagation characteristics of high-power laser beams in plasma [4][5][6]. The Drude model of electrical conduction is extensively considered in this research field [7,8].…”

Section: Introductionmentioning

confidence: 99%

Propagation Characteristics of High-Power Vortex Laguerre-Gaussian Laser Beams in Plasma

et al. 2018

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The propagation characteristics of high-power laser beams in plasma is an important research topic and has many potential applications in fields such as laser machining, laser-driven accelerators and laser-driven inertial confined fusion. The dynamic evolution of high-power Laguerre-Gaussian (LG) beams in plasma is numerically investigated by using the finite-difference time-domain (FDTD) method based on the nonlinear Drude model, with both plasma frequency and collision frequency modulated by the light intensity of laser beam. The numerical algorithms and implementation techniques of FDTD method are presented for numerically simulating the nonlinear permittivity model of plasma and generating the LG beams with predefined parameters. The simulation results show that the plasma has different field modulation effects on the two exemplified LG beams with different cross-sectional patterns. The self-focusing and stochastic absorption phenomena of high-power laser beam in plasma are also demonstrated. This research also provides a new means for the field modulation of laser beams by plasma.

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Section: Introductionmentioning

confidence: 99%

Propagation Characteristics of High-Power Vortex Laguerre-Gaussian Laser Beams in Plasma

et al. 2018

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“…[11] The steady-state self-focusing/defocusing of a laser beam in a medium is characterized by the real part of dielectric constant having saturating nonlinearity and the imaginary part being determined by multiphoton absorption under paraxial approximation. [12] Takale et al [13] investigated the self-focusing and defocusing of first six TEM op Hermite-Gaussian laser beams in collision-less plasma and found that modes with odd p-values defocus and that with even p-values exhibit oscillatory as well as defocusing character of the beam width parameter variation during laser propagation in collision-less plasma. However, it has been observed that a plasma density ramp of suitable length can reduce these oscillations.…”

Section: Introductionmentioning

confidence: 99%

Density Transition Based Self-Focusing of cosh-Gaussian Laser Beam in Plasma with Linear Absorption*

Kant¹,

Wani²

2015

Commun. Theor. Phys.

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Density transition based self-focusing of cosh-Gaussian laser beam in plasma with linear absorption has been studied. The field distribution in the plasma is expressed in terms of beam width parameter, decentered parameter, and linear absorption coefficient. The differential equation for the beam width parameter is solved by following Wentzel–Kramers–Brillouin (WKB) and paraxial approximation through parabolic wave equation approach. The behaviour of beam width parameter with dimensionless distance of propagation is studied at optimum values of plasma density, decentered parameter and with different absorption levels in the medium. The results reveal that these parameters can affect the self-focusing significantly.

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“…As regards the qualitative analysis of the behavior of solutions in a medium with saturating nonlinearity, it is often carried out on the basis of the so called aber ration free approximation [12,13] or its generaliza tions [16][17][18][19], as well as on the basis of a variational approach [20]. Qualitative analytical models based on one or other a priori assumption on the beam structure allow one to draw conclusions about the character of variation of the parameters of the beam, such as its width, part of the beam power that forms a self focused channel, and the scale of oscillations along the beam axis under periodic variation of intensity on the axis (periodic focusing-defocusing of a beam).…”

Section: Introductionmentioning

confidence: 99%

New solutions in the theory of self-focusing with saturating nonlinearity

Kovalev

Popov

Bychenkov

2012

J. Exp. Theor. Phys.

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On the basis of an approximate analytic solution of a Cauchy problem for a nonlinear Schrödinger (NLS) equation describing steady state light beams in a medium with saturating nonlinearity by the method of renormgroup (RG) symmetries, a classification of self focusing solutions is given depending on two con trol parameters: the relative contributions of diffraction and nonlinearity and the saturation strength of the nonlinearity. The existence of tube type self focusing solutions is proved for an entering beam with Gaussian radial distribution of intensity. Numerical simulation is carried out that allows one to verify the theory devel oped and to determine its applicability limits.

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Focusing of an intense Gaussian laser beam in a radially inhomogeneous medium

Cited by 24 publications

References 15 publications

Propagation Characteristics of High-Power Vortex Laguerre-Gaussian Laser Beams in Plasma

Propagation Characteristics of High-Power Vortex Laguerre-Gaussian Laser Beams in Plasma

Density Transition Based Self-Focusing of cosh-Gaussian Laser Beam in Plasma with Linear Absorption*

New solutions in the theory of self-focusing with saturating nonlinearity

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