The three-mirror selective resonator with diffraction coupling-out of radiation

The three-mirror open resonator with two inclined plates (dividing and coupling) is theoretically considered. The theory is based on the numerical solution of the integrated equations with the account of ohmic and diffraction losses owing to limitation of the sizes of mirrors, is constructed. The possibility of maintenance of longitudinal modes high selectivity with effective output as a wave beam and exceeding of useful radiation over intrinsic losses is shown.