Patent ID: 8080777
Filing Date: 2011-12-20
Classification: G01J,G02B

Abstract:
1. An optical device, comprising: a plurality of polarizers that are arranged along a propagation direction of incident light; a first phase element that is disposed between the plurality of polarizers and that has a phase lag axis forming a prescribed angle relative to transmission axes of the polarizers arranged along the propagation direction; and a second phase element that is disposed between the first phase element and one of the polarizers arranged along the propagation direction, and that provides the incident light with a prescribed phase difference, wherein an angle of the phase lag axis of the second phase element is adjusted such that the optical device transmits light in a prescribed wavelength region in the incident light, and wherein three or more of the polarizers are arranged along the propagation direction of the incident light, each of a plurality of the first phase elements is disposed respectively between a pair of the three or more polarizers, each of a plurality of the second phase elements is disposed respectively at a position immediately preceding one of the three or more polarizers and following one of the first phase elements, relative to the propagation direction.