Patent ID: 6671046
Filing Date: 2003-12-30
Classification: G02B

Abstract:
An optical measuring unit for measuring an optical property of an incoming optical beam, comprising:a polarization converter adapted for receiving the incoming optical beam and providing a first output beam and a second output beam thereof, which are spatially separated and have substantially matching states of polarization, and a polarization dependent analysis unit adapted for receiving the first and the second output beams from the polarization converter, and for measuring the optical property of both the first and the second output beams, wherein the polarization converter comprises: a polarization dependent beam splitter adapted for splitting the incoming optical beam into the first output beam of the polarization converter and into a second beam, each with a defined state of polarization but different from each other, and a polarization adapter adapted for receiving the second beam and for providing the second output beam of the polarization converter, wherein the state of polarization of the second output beam substantially matches with the state of polarization of the first output beam, wherein the first output beam and the second output beam are spatially separated from each other to avoid interference effects.