Patent ID: 7947946
Filing Date: 2011-05-24
Classification: G01N,G02B

Abstract:
1. An optical system with an imaging unit for mapping signal light from at least one light source on a target location, comprising: at least one first sinusoidal diffractive optical element (DOE) located in front of the imaging unit with respect to the optical path of the signal light; at least one second sinusoidal diffractive optical element (DOE) located behind the imaging unit with respect to the optical path of the signal light, wherein the at least one second sinusoidal DOE is configured so that the effect the first sinusoidal DOE has on the path of light rays passing therethrough is reversed by the second sinusoidal DOE; a substrate comprising a backside, wherein the first sinusoidal diffractive optical element DOE is located at the backside of the substrate and is adapted to couple out signal light of SC-modes, which comprise signal light that would otherwise be totally internally reflected at the backside; and a dichroic beam splitter disposed between the first sinusoidal diffractive optical element and the second sinusoidal optical element, and configured to reflect the SC-modes.