Title :
Study on the Terahertz Denisov Quasi-Optical Mode Convertor
Author :
Wei Wang ; Diwei Liu ; Shen Qiao ; Shenggang Liu
Author_Institution :
Terahertz Sci. & Technol. Res. Center, Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
Considering the backward waves, the coupled-mode theory for the dimpled-wall Denisov launcher has been developed. The 140-GHz TE28,8 mode was recalculated with this method and the results are consistent with those reported by Thumm´s team. With the coupled-mode theory, the Denisov-type quasi-optical mode convertor for 220-GHz TE14,4 mode gyrotron has been investigated, of which the maximal relative power of the backward waves at the launcher cut is just about 0.7%, the power-conversion efficiency is about 95%, and the scalar Gaussian mode contents are 98% at the output window.
Keywords :
Gaussian distribution; convertors; coupled mode analysis; electromagnetic launchers; gyrotrons; millimetre wave devices; Denisov quasioptical mode convertor; TE14,4 mode gyrotron; TE28,8 mode; Thumm team; backward waves; coupled mode theory; dimpled-wall Denisov launcher; frequency 140 GHz; frequency 220 GHz; power-conversion efficiency; scalar Gaussian mode contents; terahertz convertor; Converters; Couplings; Educational institutions; Gyrotrons; Optical waveguides; Plasmas; Coupled-mode theory; Denisov launcher; quasi-optical (QO) mode converter; the backward waves;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2013.2294335
