Patent ID: 6600560
Filing Date: 2003-07-29
Classification: G01B,G01N

Abstract:
An optical measurement arrangement comprising:an ellipsometer, in which an incident beam of polarized light is directed at an angle of incidence &agr;â‰ 0Â° onto a measurement location on a surface of a specimen, and information concerning properties of the specimen is obtained from an analysis of a return beam reflected from the specimen; a mirror objective through which the incident beam is directed onto the surface of the specimen, wherein the return beam is also captured by the mirror objective; measurement light guides, which comprise a plurality of light-guiding fibers, configured to couple the light reflected from the specimen into an analysis device; and a reference light guide, which comprises a plurality of light-guiding fibers, configured to convey measurement light that is uninfluenced by the specimen to the analysis device, wherein the measurement light guides have channels KS, KP corresponding to s- and p-polarized components of reflected output beams, respectively, and the reference light guide has a channel KR, and wherein entrance ends of the individual light-guiding fibers for each channel KS, KP, KR are distributed over a surface that reproduces the shape of an opening of an aperture stop, said aperture stop arranged before the mirror objective to pass a measurement light beam to the mirror objective.