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A prism reflector is described which has high reflectivity for only a very narrow angular range (∼1′). The prism makes use of multiple internal reflections near the critical angle, where the dependence of reflectivity on angle is extremely sharp. It is shown experimentally that such a prism can be used to suppress unwanted off‐axis modes in an optical maser. With a typical ruby optical maser a substantial reduction in beam width, as well as an increase in emission near the beam center, is observed. Applications to various optical masers and use as a modulator are discussed.