Distortion and cross polarization of a simple Gaussian beam on diffraction from grating couplers for Q. O. gyrotrons

H. Cao

doi:10.1117/12.2297988

4 December 2017 Distortion and cross polarization of a simple Gaussian beam on diffraction from grating couplers for Q. O. gyrotrons

H. Cao

Author Affiliations +

Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15767N (2017) https://doi.org/10.1117/12.2297988
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland

Abstract

We examine the distortion and cross polarization of a Gaussian beam diffracted from a planar grating with curvilinear grooves or from an elliptical grating with curved grooves placed in the Littrow mount. The electromagnetic field diffracted from the gratings in the 0th order and propagating to an HE₁₁ waveguide has been numerically computed. The output patterns, distortion, and cross polarizatign have been obtained for the gratings; the results agree well with the cold test results. The comparison between the gratings shows that the elliptical grating is more effective than the planar grating.

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H. Cao "Distortion and cross polarization of a simple Gaussian beam on diffraction from grating couplers for Q. O. gyrotrons", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15767N (4 December 2017); https://doi.org/10.1117/12.2297988

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