Patent ID: 7057717
Filing Date: 2006-06-06
Classification: G01J,G01N,G02B

Abstract:
1. A method of analyzing a sample at substantially the exact same spot with at least two wavelengths of electromagnetic radiation, comprising the steps of: practicing steps a and b in either order, said steps a and b being: a) providing a selection from the group consisting of: which sequentially comprises a source of polychromatic electromagnetic radiation, a polarizer, a stage for supporting a sample, an analyzer and a detector; b) providing two refractive lens systems which have been designed to provide substantially the same focal length at two wavelengths; c) placing one of said refractive lens systems provided in step b prior to a sample which is positioned on said stage for supporting a sample, and one of said refractive lens systems after said sample, each of said refractive lens systems being placed substantially a focal length distance from a specific point on said sample; d. causing polychromatic electromagnetic radiation from said source thereof to pass through said polarizer and become focused onto said sample by said refractive lens system which is placed prior to said sample, such that said two wavelengths are focused onto said sample at substantially exactly the same point thereupon, then pass through said analyzer and enter said detector; e) utilizing only data provided by said detector that is obtained at said two wavelengths for which the focal length distances are substantially the same, in sample analysis.