Patent ID: 9222765
Filing Date: 2015-12-29
Classification: G01B,G02B

Abstract:
1. A quantitative phase measurement apparatus comprising: a converging optical system for converting light to be measured produced by applying light to a measurement sample and containing phase information on the measurement sample into converging light; a reflective polarization splitting element, disposed at a focusing position of the converging light, for splitting the converging beam into two polarized beams having different polarization directions and reflecting the two polarized beams to form a first polarized beam serving as a first-order diffracted beam toward the converging optical system and a second polarized beam serving as a zero-order diffracted beam toward the converging optical system; a spatial filter, disposed at a focusing position of the first and second polarized beams focused by the converging optical system, for producing from one of the first and second polarized beams a reference beam devoid of a phase delay and a scatter component both derived from the measurement sample and producing from the other of the first and second polarized beams an object beam containing the phase delay and the scatter component both derived from the measurement sample; an interference fringe image formation optical system for forming an image of interference fringes by forming a real image of the object beam and simultaneously projecting the reference beam on the same plane as the real image of the object beam; an operation part for calculating an in-plane phase distribution of the measurement sample from the image of interference fringes; and a beam splitter, disposed between the converging optical system and the spatial filter, for performing reflection of at least a portion of the light to be measured toward the converging optical system and transmission of at least respective portions of the first and second polarized beams toward the spatial filter or performing transmission of at least a portion of the light to be measured toward the converging optical system and reflection of at least respective portions of the first and second polarized beams toward the spatial filter.