Random or periodic corrugation of the waveguide laser electrode surface may strongly influence on the waveguide mode shape, losses, and the laser beam quality. Such waveguide wall gratings can be used for phase and polarization correction of the light field. The development of the laser with such field correction elements is usually considered as a slab waveguide problem. Corrugated surface reflecting properties must be taken into account by such model. The light scattering by corrugated surface segment was investigated. The problem is formulated as electromagnetic wave diffraction on a corrugated surface segment with a periodic or statistical irregularity for the wave propagated along the electrode. The classical theory of diffraction is used. The problem for the segment of the surface is formulated as an electrodynamics problem with impedance boundary conditions. Numerical calculation of the angular dependence of the light reflection from the corrugated surface is performed. It is shown that there is an optimal groove depth giving maximum reflection at given surface structure period.
Internal field correction elements of the waveguide laser resonator on the basis of statistically homogeneous and periodic structures which can be used for enhancement of operation of CO2 waveguide laser is studied. A diffraction model that can incorporate the effect of light scattering by waveguide wall for typical experimental conditions is formulated. Resonator is divided into a number of longitudinal segments to obtain required precision. Optical losses for eigenmodes of such system (eigenvalues of the round-trip propagation operator) have been investigated for different parameters of the waveguide resonator. A direct comparison between theoretical losses behavior and experimentally measured ones demonstrated a satisfactory agreement for various conditions.
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