Design of High-performance 110GHz Quasi- Optical Mode Converter for Gyrotron Applications

This paper presents the design and analysis of a prototype quasi-optical mode converter with high conversion efficiency for 110GHz
$\text{TE}22,6$
applications. The mode converter incorporates the Denisov launcher, which is based on the periodic perturbation concept, resulting in a primary radiation field with low edge diffraction. An iterative phase correction technique, based on the co-polarization field component, is employed to achieve high-quality mode conversion. Numerical investigations confirm that the phase-shaped mirror system significantly improves conversion performance. The design has achieved remarkably high Gaussian content reaching 99.89% for co- polarization, as well as relatively high power transmission efficiency reaching 99.13%.