Patent ID: 7845798
Filing Date: 2010-12-07
Classification: A61F,G01J

Abstract:
1. An eye surgery system for observing an object with an optical system, wherein the eye surgery system is configured to provide a first beam path for light of a first range of wave lengths and to provide a second beam path and a third beam path for light of a second range of wave lengths, wherein the object is arranged in the first, second and third beam paths and wherein the optical system comprises a dichroic beam splitter, a polarizing beam splitter and a retarding plate, wherein the eye surgery system is configured such that (a) the first beam path traverses the dichroic beam splitter and the second and the third beam paths are reflected at the dichroic beam splitter, or (b) the second and third beam paths traverse the dichroic beam splitter and the first beam path is reflected at the dichroitic beam splitter, (c) the second beam path traverses the polarizing beam splitter and the third beam path is reflected at the polarizing beam splitter, or (d) the third beam path traverses the polarizing beam splitter and the second beam path is reflected at the polarizing beam splitter, and (e) for light, which is polarized along the extraordinary axis, and light, which is polarized substantially orthogonal to the extraordinary axis, a relative phase difference is provided, which satisfies: wherein (f) the extraordinary axis of the birefringent material has an angle relative to the direction of polarization of the light of the second beam path, which has traversed or is reflected at the polarizing beam splitter, wherein the angle satisfies: wherein: