TITLE

Self-focusing and defocusing of Gaussian laser beams in plasmas with linear temperature ramp

AUTHOR(S)
Zhou, Zhongxiang; Wang, Ying; Yuan, Chengxun; Du, Yanwei
PUB. DATE
July 2011
SOURCE
Physics of Plasmas;Jul2011, Vol. 18 Issue 7, p073107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The propagation characteristics of the Gaussian laser beam in plasmas in the presence of a linear electron temperature ramp have been investigated by taking the electron temperature as an individual variable. The ponderomotive force and collision have been considered as the mechanisms of nonlinearity. The second order differential equation of the dimensionless beam-width parameter has been acquired and solved with several initial electron temperatures and plus-minus temperature ramp parameters. The propagation regimes of laser beam are found to be sensitive with the selection of electron temperature. The linear temperature ramp breaks the stationary propagating mode and enhances the self-focusing or defocusing propagation properties. Results indicate the feasibility of extended propagation of focused laser beam in plasmas by modifying the electron temperature.
ACCESSION #
63542407

 

Related Articles

  • Filamentation instability in an inhomogeneous laser-produced plasma. Sharma, A. K.; Mishra, G. // Journal of Applied Physics;12/15/1987, Vol. 62 Issue 12, p4725 

    Presents information on a study which investigated the effect of an axial density gradient on the filamentation of a laser beam. Discussion of the zero-frequency ponderomotive force on the electrons; Electromagnetic perturbation of the equilibrium; Equation of the exponential density profile.

  • Hydrodynamic coupling of a speckled laser beam to an axially flowing plasma. Bezzerides, B.; Vu, H. X.; Kopp, R. A. // Physics of Plasmas;Jan2001, Vol. 8 Issue 1, p249 

    A plasma with a background flow along the direction of propagation of a laser beam is examined. The laser beam is subject to the beam-smoothing properties of a random phase plate. A simple model for the speckled properties of the laser beam is employed to show that the combined effect of the...

  • Collisional absorption of laser light in under-dense plasma: The role of Coulomb logarithm. Kundu, M. // Physics of Plasmas;Jan2014, Vol. 21 Issue 1, p1 

    In this work, we re-examine collisional absorption of 800 nm wavelength laser pulses in underdense plasma. For a given temperature and density of the plasma, most of the conventional models of the electron-ion collision frequency νei, with a Coulomb logarithm independent of the...

  • Effect of induced spatial incoherence on flow induced laser beam deflection: Analytic theory. Ghosal, Sandip; Rose, Harvey A. // Physics of Plasmas;Dec97, Vol. 4 Issue 12, p4189 

    Presents analytic results for the laser beam deflection rate in the case of spatial and temporal smoothing by induced spatial incoherence. Decrease in the beam deflection rate due to temporal smoothing; Expression for the electric field at the focal plane; Relation of the beam deflection rate...

  • The effects of optical smoothing techniques on filamentation in laser plasmas. Schmitt, Andrew J. // Physics of Fluids (00319171);Oct88, Vol. 31 Issue 10, p3079 

    The effect of the induced spatial incoherence (ISI) and the random phase screen (RPS) optical smoothing techniques on the filamentation instability in laser plasmas has been investigated numerically and analytically. A two-dimensional time-dependent laser-plasma propagation code, including both...

  • Sustained Acceleration of Over-dense Plasmas by Colliding Laser Pulses. Liang, Edison // AIP Conference Proceedings;2006, Vol. 827 Issue 1, p277 

    We review recent PIC simulation results which show that double-sided irradiaton of a thin overdense plasma slab by ultra-intense laser pulses from both sides can lead to sustained comoving acceleration of surface electrons to energies much higher than the conventional ponderomotive limit. The...

  • Enhanced focusing of laser beams in semiconductor plasmas. Gupta, D. N.; Suk, H. // Journal of Applied Physics;2/15/2007, Vol. 101 Issue 4, p043109 

    The beating of two copropagating laser beams (having frequency difference Δω≈ωp, where ωp is the plasma frequency) can resonantly excite a large amplitude plasma wave in a narrow-gap semiconductor [V. I. Berezhiani and S. M. Mahajan, Phys. Rev. B 55, 9247 (1997)]. The...

  • Hybrid proton acceleration scheme using relativistic intense laser light. Andreev, A. A.; Platonov, K. Yu.; Schnürer, M.; Prasad, R.; Ter-Avetisyan, S. // Physics of Plasmas;Mar2013, Vol. 20 Issue 3, p033110 

    Ion acceleration phenomena at relativistic intense laser interaction with thin foil targets are studied to find an efficient laser-target interaction concept at the conditions, where neither the ponderomotive pressure of the laser light nor the hot electron pressure is negligible. Particle in...

  • Propagation characters of Gaussian laser beams in collisionless plasma: Effect of plasma temperature. Wang, Ying; Zhou, Zhongxiang // Physics of Plasmas;Apr2011, Vol. 18 Issue 4, p043101 

    This paper presents an investigation of the propagation characters of Gaussian laser beam in cold collisionless plasma by considering the plasma temperature variation. The ponderomotive nonlinearity is involved and induces the nonlinear self-focusing against spatial diffraction. The second-order...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics