Anti-aliasing diffractive aperture and optical system using the same: USPTO

In one embodiment, an anti-aliasing apparatus is disclosed. The anti-aliasing apparatus includes an aperture stop including an array of apertures. Each of the apertures on the aperture stop diffracts light passing therethrough and provides spreading of an image of a point object in a controlled image irradiance distribution. In another embodiment, an optical system is disclosed. The optical system includes a detector array having an array of pixels and an aperture stop positioned between an object plane and the detector array. The aperture stop includes an array of apertures, each of which diffracts light passing therethrough and provides a controlled spreading of the light to cover more than one pixel of the detector array.