Patent ID: 7564553
Filing Date: 2009-07-21
Classification: G01J,G03F

Abstract:
1. A polarization determination device for evaluating a state of polarization of an illumination light illuminated onto a transfer substrate in exposure equipment, comprising: a determination stage provided moveably on a stage of said exposure equipment; a light interceptor having a plurality of fine apertures; a transparent substrate arranged upstream of said illumination light than said light interceptor and having a first spherical surface depressed about said fine aperture in a surface opposite to said light interceptor; a plurality of quarter-wave plates arranged downstream of said illumination light than said light interceptor and formed to cover said fine apertures, and having orientation angles of the fast axis differing in increments of certain angle; a plurality of polarizers arranged downstream of said illumination light than said quarter-wave plates and formed as superimposed on said quarter-wave plates to cover said plurality of fine apertures, and having orientation angles of the transmissive polarization differing in increments of certain angle; and a photodetector arranged downstream of said illumination light than said polarizer to detect light transmitted through said polarizer,