Patent ID: 7630085
Filing Date: 2009-12-08
Classification: G01B,G01J

Abstract:
1. An interferometer system, comprising: a light source providing a light beam; an objective lens having a magnification of five times or higher; a beam splitter that splits the light beam into a reference beam and a sample beam; a reference mirror that reflects the reference beam back to the beam splitter; a sample holder having a supporting surface on which a sample can be disposed, the sample having a surface to be measured; a first compensation lens disposed between the beam splitter and the sample holder for compensating an aberration introduced by a first light transmissive substrate disposed over the sample surface to be measured; a second compensation lens for compensating an aberration introduced by an interior reflecting surface of a beam splitter house in which the beam splitter is disposed; and wherein the sample holder or the reference mirror is movable relative to the beam splitter so as to adjust an optical path of the system to form an interference fringe.