Radially polarized radiation of 1.8 kW was first obtained in an industrial high-power CO 2 laser. Special reflective elements with an axial polarization selectivity of 22% were used as a rear mirror in the laser. The output radiation consisted mainly of an unpolarized mode TEM 00 and a radially polarized mode R-TEM 01 * .
A description of nonstationary simple waves and Riemann invariants in a relativistically hot electron-positron magnetoplasma is presented. It is noted that at relativistic temperatures the photon energy far exceeds the internal kinetic energy and that the particle effective mass depends strongly on the temperature. Starting from a set of relativistic radiation magnetohydrodynamic equations, the nonlinear characteristics and velocities of simple waves are obtained. The equations are further employed to examine the Riemann invariants in the presence of isentropic flow. It is found that at ultra-relativistic temperatures the photon pressure and the relativistic mass variation play a very important role.
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