Impact of linear absorption on self-focusing of Gaussian laser beam in collisional plasma

Navare, S.T.; Takale, M. V.; Patil, Saiprasad; Fulari, V. J.; Dongare, M. B.

doi:10.1016/j.optlaseng.2012.02.015

Cited by 27 publications

(8 citation statements)

References 31 publications

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“…In other words, the laser beam shows self-focusing up to a certain critical value and then defocusing character is observed. This is because, for the self-focusing to occur the laser power should exceed a critical value as presented by Sprangle et al [24] and Wang et al [29] Further, the results of present analysis can be compared with those of Navare et al, [36] wherein increase in collision frequency is subjected to increase in oscillation amplitude of beam width parameter. Moreover, for higher values of ν/ω 0 , the absorption is more significant and overcomes the self-focusing effect.…”

Section: Resultsmentioning

confidence: 66%

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Self-Focusing/Defocusing of Chirped Gaussian Laser Beam in Collisional Plasma with Linear Absorption

Wani

Kant

2016

Commun. Theor. Phys.

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This paper presents an investigation on the self-focusing/defocusing of chirped Gaussian laser beam in collisional plasma with linear absorption. We have derived the differential equation for the beam width parameter by using WKB and paraxial approximations and solved it numerically. The effect of chirp and other laser plasma parameters is seen on the behavior of beam width parameter with dimensionless distance of propagation. The results are discussed and presented graphically. Our simulation results show that the amplitude of oscillations decreases with the distance of propagation. Due to collisional frequency, the laser beam shows fast divergence which can be minimized by the introduction of chirp parameter. The chirp decreases the effect of defocusing and increases the ability of self-focusing of laser beam in collisional plasma.

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Section: Resultsmentioning

confidence: 66%

“…Therefore, the self-focusing of laser beam occurs earlier and thus supports the results. [36,38] 0 . The relative plasma density is fixed at ω p /ω 0 = 0.4 and the other parameters are same as mentioned in Fig.…”

Section: Resultsmentioning

confidence: 99%

Self-Focusing/Defocusing of Chirped Gaussian Laser Beam in Collisional Plasma with Linear Absorption

Wani

Kant

2016

Commun. Theor. Phys.

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“…Hence, in comparison to Refs. [36] and [37], by applying the density ramp and taking into account the effect of linear absorption, we observe that self-focusing occurs earlier even at ξ = 0.02. Hence self-focusing length increases with absorption level under the influence of plasma density ramp.…”

Section: Resultsmentioning

confidence: 81%

“…However, Patil et al [36] have studied the self-focusing of cosh-Gaussian beams in a parabolic medium at various values of linear absorption (k i ) and decentered parameter (b) and found that the self-focusing length increases with absorption level. Further, in the work of Navare et al, [37] while considering the collisional nonlinearity, they found that the absorption plays a vital role in the self-focusing effect and destroys the oscillatory self-focusing character of laser beam during propagation. Hence, in comparison to Refs.…”

Section: Resultsmentioning

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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“…The effective dielectric function gets modified significantly, due to selfinduced nonlinearity dependence on the intensity of the laser beam [8]. The propagation of different kinds of laser beam profiles like Gaussian beams [9,10], Cosh-Gaussian beams [11][12][13], Hermite -Gaussian beams [14], Hermite-cosh-Gaussian (HChG) beams [15][16][17] etc., in the collisional plasmas has attracted the attention of the many researchers. One should note that in all above beams Gaussian remains intact.…”

Section: Introductionmentioning

confidence: 99%

On the Exploration of q Parameter in Propagation Dynamics of q-Gaussian Laser Beam in Underdense Collisional Plasma

2022

Bulg.J.Phys.

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In the present paper, the nonlinear features of a high-intensity q-Gaussian laser beam propagating in collisional plasma have been investigated. The collisional plasma dynamics is basically dominated by local collisional forces rather than collective actions in it. Naturally, the nonlinearity in the dielectric function of plasma due to nonuniform heating of carriers along the wavefront of the laser beam becomes important. Here in q-Gaussian beam intensity profile q can explored right from extremely low to extremely high value such as infinity. As a consequence of it studies in propagation dynamics becomes quite interesting. By following Akhmanov parabolic equation approach under Wentzel-Kramers-Brillouin (WKB) and paraxial approximations, the differential equation is set up for the beam width parameter f and is solved numerically. The significant effect of wide range of q on critical beam radius as well as on propagation a dynamic of q-gaussian laser beam have been found interesting and is presented graphically.

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Impact of linear absorption on self-focusing of Gaussian laser beam in collisional plasma

Cited by 27 publications

References 31 publications

Self-Focusing/Defocusing of Chirped Gaussian Laser Beam in Collisional Plasma with Linear Absorption

Self-Focusing/Defocusing of Chirped Gaussian Laser Beam in Collisional Plasma with Linear Absorption

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

On the Exploration of q Parameter in Propagation Dynamics of q-Gaussian Laser Beam in Underdense Collisional Plasma

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