Gaussian Laser Beam in a Magnetized Plasma

概要

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A narrow electromagnetic beam propagating parallel to an external magnetic field in a plasma is considered theoretically. The theory assumes that the plasma pressure is larger than the electromagnetic one. It is found that under the paraxial approximation the beam having a Gaussian cross section can propagate. The Rayleigh range is enlarged or shortened depending on the dielectric coefficients of the plasma. The beam is either right- or left-hand polarized and both modes have the longitudinal component of the electric field as the Gaussian beam does in vacuum. The phase velocities can become less than the light velocity c for some plasma parameters for which those velocities of the plane R- and the L-waves are always greater than c.
社団法人日本物理学会の論文
1995-11-15