A quasi-optical mode converter with a bifocal mirror

Author

Iatrou, Christos T.

Author_Institution

Thomson Tubes Electron., Velizy-Villacoublay, France

Volume

43

Issue

3

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

529

Lastpage

533

Abstract

This paper presents the design procedure of a quasi-optical mode converter to transform any kind of TE_mn mode into a Gaussian wave beam and experimental results obtained in the particular case of the TE₆₄ mode at 110 GHz. The quasi-optical system consists of a helical-cut launcher and a bifocal mirror, which is designed, using the techniques of geometric optics, to focus the radiation of the launcher into a Gaussian focal spot. Such a system was fabricated and tested for the transformation of the TE₆₄ mode. The experimental results showed that about 80% of the power incident in the focal plane is focused into a small Gaussian-like spot of less than 20 mm diameter, while 97% of the power is contained into the main TE₆₄ lobe

Keywords

geometrical optics; helical waveguides; millimetre wave couplers; waveguide couplers; 110 GHz; Gaussian focal spot; Gaussian wave beam; TE_mn mode; Vlasov-type coupler; bifocal mirror; geometric optics; helical-cut launcher; quasi-optical mode converter; Electron tubes; Geometrical optics; Gyrotrons; Heating; Mirrors; Optical design; Optical waveguides; Tellurium; Waveguide components; Whispering gallery modes;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.372097

Filename

372097