1.College of Information Science and Technology， Beijing University of Chemical Technology， Beijing 100029， China;2.National Key Laboratory of Science and Technology on Vacuum Electronics， Beijing Vacuum Electronics Research Institute， Beijing 100015， China;3.School of Electronic Information Engineering， Beihang University， Beijing 100191， China
Supported by the Aeronautical Science Foundation of China（202000180S9001）， and Fundamental Research Funds for the Central Universities（buctrc201931）
A high conversion efficiency quasi-optical mode converter prototype is designed for 140 GHz TE22，6 applications. The Denisov launcher is designed based on the periodic perturbation concept， leading to primary radiation field with low edge diffraction. Full-vector physical optics integration solver is used to model and analyze the 3-mirror system. And the 3-mirror iterative phase correction is applied based on the co-polarization field component， so as to achieve high-quality mode conversion. Specifically， the correction of the 1st mirror sufficiently refines the non-ideal radiated fields from the launcher. It is then validated by numerical investigations that， comparing to the original quaritic mirrors， the phase-shaped mirror system leads to excellent conversion performance. The Gaussian content （ηv） of the output fields rises from 92.7% to 99.6%， while the power transmission efficiency （ηp） reaches 98.8%.
JIN Ming, WANG Dan-Yang, ZHANG Yi-Chi, HAN Yu-Nan, BAI Ming. On the design of high conversion efficiency quasi-optical mode converter for 140 GHz high-power gyrotron applications[J]. Journal of Infrared and Millimeter Waves,2023,42(2):234~240Copy