Relativistic self-induced transmission of Gaussian laser beam through high density plasma

2021 ◽  
Author(s):  
Sonu Sen ◽  
Meenu Asthana Varshney
Keyword(s):  
Laser Beam ◽  
High Density ◽  
Gaussian Laser Beam ◽  
Density Plasma

scholarly journals Terahertz radiation by self-focused amplitude-modulated Gaussian laser beam in magnetized ripple density plasma

2015 ◽  
Vol 33 (4) ◽  
pp. 741-747 ◽  
Author(s):  
Ram Kishor Singh ◽  
R. P. Sharma
Keyword(s):  
Magnetic Field ◽  
Laser Beam ◽  
Applied Magnetic Field ◽  
Magnetized Plasma ◽  
Thz Radiation ◽  
Gaussian Laser Beam ◽  
Spatial Profile ◽  
Self Focusing ◽  
Oscillatory Velocity ◽  
Density Plasma

AbstractThis paper presents a theoretical model for efficient terahertz (THz) radiation by self-focused amplitude-modulated laser beam in preformed ripple density plasma. The density of plasma is modified due to ponderomotive nonlinearity which arises because of the nonuniform spatial profile of the laser beam in magnetized plasma and leads to the self-focusing of the laser beam. The rate of self-focusing depends on the intensity of the amplitude-modulated beam as well as on the externally applied magnetic field strength. The electron also experiences time-dependent ponderomotive force by the laser beam at modulated frequency. A nonlinear current at THz frequency arises on account of the coupling between the ripple density plasma and nonlinear oscillatory velocity of the electrons. The yield of the generated THz radiation enhances with enhancement in self-focusing of the laser beam and applied magnetic field.

Terahertz generation by an amplitude-modulated Gaussian laser beam in a rippled density plasma column

2010 ◽  
Vol 82 (3) ◽  
pp. 035504 ◽  
Author(s):  
Deepak Tripathi ◽  
Lalita Bhasin ◽  
R Uma ◽  
V K Tripathi
Keyword(s):  
Laser Beam ◽  
Plasma Column ◽  
Terahertz Generation ◽  
Gaussian Laser Beam ◽  
Density Plasma

scholarly journals THz radiation by amplitude-modulated self-focused Gaussian laser beam in ripple density plasma

2015 ◽  
Vol 33 (2) ◽  
pp. 257-263 ◽  
Author(s):  
Subodh Kumar ◽  
Ram Kishor Singh ◽  
Monika Singh ◽  
R. P. Sharma
Keyword(s):  
Laser Beam ◽  
Ponderomotive Force ◽  
Modulation Frequency ◽  
Transverse Component ◽  
Thz Radiation ◽  
Gaussian Laser Beam ◽  
Laser Propagation ◽  
Transverse Current ◽  
Self Focusing ◽  
Density Plasma

AbstractThe effect of self-focusing and defocusing on terahertz (THz) generation by amplitude-modulated Gaussian laser beam in rippled density plasma is investigated. A stronger transient transverse current is generated by transverse component of ponderomotive force exerted by laser on electrons that drives radiation at the modulation frequency (which is chosen to be in the THz domain) because of the variation in intensity in the direction transverse to the laser propagation. Numerical simulations indicate the enhancement of THz yield by many folds due to self-focusing of laser beam in comparison with that without self-focusing. The transient focusing of laser beam and its effect on the generated THz amplitude has also been studied.

scholarly journals Relativistic effects on propagation of q-Gaussian laser beam in a rippled density plasma: Application of higher order corrections

2018 ◽  
Vol 36 (2) ◽  
pp. 246-253 ◽  
Author(s):  
M. Kaur ◽  
P. C. Agarwal ◽  
S. Kaur ◽  
T. S. Gill
Keyword(s):  
Laser Beam ◽  
Relativistic Effects ◽  
Beam Width ◽  
High Energy ◽  
Higher Order ◽  
High Energy Density ◽  
Parabolic Partial Differential Equation ◽  
Gaussian Laser Beam ◽  
Self Focusing ◽  
Density Plasma

AbstractA nonparaxial investigation for propagation characteristics of q-Gaussian laser beam in rippled density plasma is studied by considering the relativistic nonlinearity. The field distribution in the medium is expressed in terms of q parameter and beam width parameter f. Nonlinear parabolic partial differential equation governing the evolution of complex envelope in slowly varying approximation is solved in a modulated density profile. Analytical theory of self-focusing including higher order terms in the expansion of dielectric function up to fourth order is developed and the variation of beam width parameter f with the distance of propagation for different parameters is studied. One may note that increased value of density ripple, laser intensity and depth of modulation, increases self-focusing whereas a lower value of q shows strong self-focusing. A comparative study between paraxial and nonparaxial study has also conducted. This study is useful for research in high energy density physics.

Self-focusing of cosh-Gaussian laser beam in collisional plasma: effect of nonlinear absorption

2021 ◽  
Author(s):  
Naveen Gupta ◽  
Sandeep Kumar ◽  
A Gnaneshwaran ◽  
Sanjeev Kumar ◽  
Suman Choudhry
Keyword(s):  
Laser Beam ◽  
Nonlinear Absorption ◽  
Collisional Plasma ◽  
Gaussian Laser Beam ◽  
Self Focusing ◽  
Plasma Effect

A model of Gaussian laser beam self-trapping in optical tweezers for nonlinear particles

2021 ◽  
Vol 53 (8) ◽  
Author(s):  
Quy Ho Quang ◽  
Thanh Thai Doan ◽  
Kien Bui Xuan ◽  
Thang Nguyen Manh
Keyword(s):  
Laser Beam ◽  
Optical Tweezers ◽  
Gaussian Laser Beam ◽  
Self Trapping
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