JPS5661803A - Fine adjusting method for resonance frequency of cavity resonator - Google Patents

Abstract

PURPOSE:To secure a fine adjustment for the resonance frequency of a cavity resonator, by inserting metal grains between the cavity resonator and the glass cell into which Rb is enclosed. CONSTITUTION:The gap between the cylindrical glass cell 13 and the cavity resonator 14 is blocked with Si paste to avoid the swing of the cell 13. And the metal grains are put into the gap through the small hole 15 of the resonator 14. Both the electric and magnetic dipoles which are vibrated by the metal grains are induced by the electromagnetic wave. The vibrating dipoles radiate the electromagnetic waves, and as a result the resonance frequency of the cavity resonator varies. The resonance frequency is reduced when the metal grains are put into the area where no magnetic field exists with the electric field having a finite size in the resonator 14. In case the metal grains are put into the side wall area equidistant from the bottom surface of the cylinder of the resonator 14, the resonance frequency decreases. While the frequency increses if the metal grains are put into the area close to the bottom surface. The number of the metal grains to be put in is controlled, and the grains are fixed with the paste to prevent the variance of the fine adjustment. In such way, an utmost application is possible for the light given from the Rb lamp with a simple fine adjustment and via a glass cell of a simple structure.