“Bush” oscillations in a diffraction radiation oscillator

The oscillatory circuit of a diffraction radiation oscillator (DRO) represents a composite two-level hemispherical open resonator (OR) whose plane mirror is partially covered with a periodic structure in the form of reflection grating. The latter much changes the original OR field. This communication presents the field distribution and the mode structure of the DRO oscillatory circuit depending on the reflection grating lifting above the plane mirror