OPTICAL RESONATOR WITH DIRECT GEOMETRIC ACCESS TO THE OPTICAL AXIS

摘要

The invention relates to a stable optical resonator in which an obstacle is formed or arranged on the optical axis in the form of a through-opening (6) in one of the mirrors (1-4, 7, 8) or in the form of an incoupling or outcoupling element in order to allow a direct geometric access to the optical axis. The mirrors (1-4, 7, 8) of the resonator are arranged such that multiple transverse eigenmodes of the resonator decompose without an obstacle, and an intensity minimum is achieved by means of the combination of said eigenmodes at the location of the through-opening or the incoupling or outcoupling element in the resonator with an obstacle. Using this design, an optical resonator of high finesse, said resonator having a location with an intensity maximum on the optical axis, can be implemented in a simple manner, for example comprising only two curved mirrors with a design freedom with respect to the resonator length and the focus diameter.