Design of quasi-optical mode converter for 94GHz gyrotron

In this paper a quasi-optical mode converter including a simple, easily manufacturable Vlasov launcher, one parabolic mirror and one elliptical mirror for 94GHz TE
_6,2
mode gyrotron is designed. Vlasov launcher is analyzed in terms of geometric optics theory, the radiation field is calculated by Stratton-Chu formula, a simulation code is written to optimize the reflected mirrors. The simulation results show that the power transmission efficiency of the operating cavity mode to a fundamental Gaussian distribution is 84.15%, the scalar correlation coefficient is greater than 90% at the window plane.