Patent ID: 6917419

Claim:
A system configured to determine at least three properties of a specimen during use, comprising: a stage configured to support the specimen during use, wherein the specimen comprises a wafer; a measurement device coupled to the stage, comprising: an illumination system configured to direct energy toward a surface of the specimen during use; and a detection system coupled to the illumination system and configured to detect energy propagating from the surface of the specimen during use, wherein the measurement device is configured to generate one or more output signals responsive to the detected energy during use; and a processor coupled to the measurement device and configured to determine a first property, a second property, and a third property of the specimen from the one or more output signals during use, wherein the first property comprises a flatness measurement of the specimen, wherein the second property comprises a presence of defects on the specimen, wherein the defects comprise defects on a bottom surface of the specimen and defects on an upper surface of the specimen, and wherein the third property comprises a thin film characteristic of the specimen.