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A method of calculation is proposed and total energy losses in one round trip for lower EH1m, TE0m and TM0m modes are obtained numerically for diffraction mirror in the form of a circular diaphragm which placed inside a dielectric circular hollow waveguide. It is shown that the use of diffractive mirrors with large-scale irregularities in a dielectric waveguide resonator is the preferred among intracavity...
Theoretically on the basis of the vectorial Rayleigh-Sommerfeld theory and experimentally using terahertz radiation of the waveguide laser (λ = 0.4326 mm) the physical features of propagation and “moderate” or “sharp” focusing of laser beams of radiation are investigated in free space which described by modes of circular hollow dielectric waveguide with different spatial polarization.
Theoretical and experimental comparison of the divergence of TE01 mode and Gaussian beam can be concluded that the obtained analytical expressions in nonparaxial approximation correctly describe the propagation of waveguide modes in free space. Stable structure of the field for the symmetric waveguide modes in the terahertz range is observed at shorter distances, unlike the distances predicted by...
The method of calculation is proposed and coefficients of reflection and transmission of symmetric modes are obtained numerically for diffraction mirror in the form of a radial or circular diaphragms which placed inside a metal circular waveguide. The conditions of application of the polarization-selective mirrors for obtaining the modes with a given azimuthal or radial polarization in waveguide quasi-optical...
The influence of the curvature of the spherical mirror for metallic waveguide resonator of submillimeter laser (» = 0.4326 mm) on energy losses and the mode composition of radiation is investigated. It is shown that the presence of quadratic phase aberrations in the mirrors of the waveguide cavity with an increase of its Fresnel number at monotonically decreasing of the energy losses for fundamental...
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