Patent ID: 7420669
Filing Date: 2008-09-02
Classification: G01N,G01R,H01L

Abstract:
1. A wafer characterization system, comprising: a chamber; a wafer rotation mechanism operable to rotate a wafer within the chamber; an optical probe including laser focusing optics operable to focus laser light on a surface of the wafer and a laser light detection mechanism operable to detect laser light reflected from the surface of the wafer; and a probe translation mechanism operable to move the optical probe adjacent the surface of the wafer; and wherein the laser light detection mechanism includes: a diffuse light detector and a diffuse light director directing only diffuse reflected laser light from the surface of the wafer to the diffuse light detector; a near specular light detector and a near-specular light director directing only near-specular reflected laser light from the surface of the wafer to the near-specular light detector; and a specular light detector and a specular light director directing only specular reflected laser light from the surface of the wafer to the specular light detector.