Patent ID: 7532019
Filing Date: 2009-05-12
Classification: G01J

Abstract:
1. A measuring apparatus configured to measure a polarization characteristic and a transmission wavefront of a test object, said measuring apparatus comprising: a Transmission Sphere (TS) lens configured to split light from a light source into reference light and light under test; a camera configured to image an interference pattern formed by interference between the reference light and the light under test; and an actuator configured to change an optical path length difference between the light under test and the reference light by driving the TS lens, wherein a polarization characteristic matrix in a pupil plane of the test object is measured by accumulating a plurality of the interference patterns imaged using the camera by changing the optical path length difference by an integral multiple of a wavelength of the light from the light source, at the actuator, and by using the camera to image an intensity distribution of an accumulated light amount in which an interference component is canceled out.