“…On the basis of the above electrodynamic systems the papers [34,35] suggest modifications of quasioptical solid-state pump oscillators with spherical corner-echelette OR, which are structurally realized upon the circuits with reactively reflecting and transmission-type resonators. As shown in [12] the oscillatory system of the corner-echelette ОR possesses a number of particularities: the degree of sparseness of the corner-echelette ОR spectrum is a bit less than of the spectrum of the OR with plane echelette mirror; however, the spectrum has the oscillation modes with an abnormally high Q-factor, which are classified as the quasi-basic modes of oscillations; the field of the quasi-basic oscillation modes is drawn to the OR axis and the density of their power is larger than for the basic ones and the rest of the oscillation modes; in the vicinity of the corner-echelette mirror the field structure undergoes a transformation and near the OR top it is similar to the structure of the field within a rectangular waveguide; corner-echelette mirror is the multi-step impedance transformer.…”