Resonance Characteristics of Fabry-Perot Resonator with a Dielectric Plate Inserted between the Mirrors

Abstract

Peculiar characteristics of a Fabry-Perot resonator with a dielectric plate inserted between the mirrors are reported. A simple theoretical consideration shows that, when the two mirrors are moved with the resonance condition maintained, the magnitudes of the two displacements are generally not equal; if the frequency of the electromagnetic wave is changed so as to recover the resonance condition that is broken by the change in the mirror separation, the required frequency shift generally depends on the position of the dielectric plate.