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Abstract

The invention bases on the idea to, in an optical resonator with a prism (1) as reflecting end element, equip the prism (1) with a focusing effect. The focusing effect can e.g. come about by means of a curved surface (12) or by means of an internal lens effect. By introducing the focusing effect the angular dispersion is considerably increased if the resonator parameters are chosen suitably; thus a high negative dispersion of the group velocity or a strong spatial mode or wavelength separation respectively on a short path length is made possible. In an embodiment the optical resonator is restricted by a first reflecting end element (1) and a second reflecting end element (3). The first reflecting end element (1) is designed as a focusing solid body with a first, plane optical surface (11) and a second optical surface (12), whereby the second optical surface (12) is reflective. The resonator further contains a further focusing element (4). The light (51, 52) hits the first surface (11) of the solid body (1) and is refracted into the solid body (1). On the second, curved surface (12) the light (51, 52) is focused and simultaneously reflected normally such that it spreads along its entry axis in opposite direction. This resonator is e.g. suitable for compensation of dispersion for ultrashort pulse lasers.

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