Excitation of the Wave TE01 in a Circular Waveguide by Means of the Higher Oscillations of an Open Resonator

The paper analyses the excitation efficiency of the TE01 wave in a segment of the circular waveguide that is made in the center of one of the mirrors of the open resonator (OR) with the help of the higher order modes ТЕМ11q (in the Lagerr-Gauss functions) and TEM30q (in the Hermite-Gauss functions) and the degenerate mode TEM*11q. All calculations were carried out taking into account the vector nature of the electric field. The analysis results established that the maximum excitation efficiency of the TE01 wave in a circular waveguide using the TEM11q mode is 0.161. The excitation efficiency of the same wave using the TEM30q oscillation is equal to 0.121. When the considered wave was excited by using only the central part of the TEM*11q mode (in the Lagerr-Gauss functions) the maximum excitation efficiency of the TE01 wave grew up to 1. The maximum excitation efficiency of the same wave with the help of the central part of the TEM*11q oscillation (in the Hermite-Gauss functions) is slightly lower and amounts to 0.954. The amplitude distribution of the field of the considered wave takes the form of a ring in the mirror of the OR.