A diamond-shaped lens system includes: a half diamond-shaped lens including refractive material and having a first surface, a second surface and a third surface for refracting incident light beams from an object having a width of X, from the first surface towards the second surface; a first reflective material positioned at the second surface of the half diamond-shaped lens for reflecting the refracted light beams at a first angle toward the third surface; a second reflective material positioned at the third surface of the half diamond-shaped lens for reflecting the light beams reflected from the first reflective material toward the first surface to exit the first surface at a second angle toward the third surface to form an image of the object with a width Y; and; an apparatus for processing the image of the object to reduce chromatic aberrations.

A near eye or heads up display system includes at least one light source, an imaging device, and an optical structure. The at least one light source can be, e.g., a red light source that produces light within a red wavelength range that has at least two different narrow bands of light having respective different emission peaks. The imaging device produces an image using light produced by the light source(s). The optical structure is configured to transfer light corresponding to the image from an input-pupil to an output-pupil where the image is viewable. By producing at least two different narrow bands of light having respective different emission peaks within a color (e.g., red) wavelength range, and taking advantage of chromatic dispersion, a more uniform intensity distribution is provided in the viewable image compared to if only one narrow band of light within the color wavelength range were produced.

A one-piece optical element for focusing an input bundle of collimated rays around an optical axis in a focal region around a focal point. The optical element is bounded on the entry side by a truncated cone centered relative to the optical axis with a top surface pointing toward the light entry and bounded on the exit side by a cone with a cone tip pointing toward the light exit on the optical axis and a rotationally symmetric aspheric boundary surface arranged around the cone. The cone is formed as a complementary cone to the truncated cone. The aspheric boundary surface is formed as a partial surface of the convex surface of a plano-convex aspheric converging lens with a focal point located behind the light exit of the optical element on the optical axis. The lateral surfaces of the truncated cone and of the cone are formed reflecting inwardly and spaced apart along the optical axis so that the approximately collimated input bundle is directed from the inner side of the lateral surface of the cone to the inner side of the lateral surface of the truncated cone.

A head up display can use a catadioptric collimating system. The head up display includes an image source. The head up display also includes a collimating mirror, and a polarizing beam splitter. The light from the image source enters the beam splitter and is reflected toward the collimating mirror. The light striking the collimating mirror is reflected through the beam splitter toward a combiner. A field lens can include a diffractive surface. A corrector lens can be disposed after the beam splitter.

An imaging system with a diffractive optic captures an interference pattern responsive to light from an imaged scene to represent the scene in a spatial-frequency domain. The sampled frequency-domain image data has properties that are determined by the point-spread function of diffractive optic and characteristics of scene. An integrated processor can modified the sampled frequency-domain image data responsive to such properties before transforming the modified frequently-domain image data into the pixel domain.

Metasurfaces comprise an array of pillars in a lattice. The dimensions of the pillars and the spacing are varied to obtain desired optical properties. The dispersionless metasurfaces can focus optical light over a broad wavelength range. Specific dispersion profiles for the metasurfaces can be designed. Gratings can be fabricated having similar properties as the array of pillars. Pillars in the metasurfaces can have different cross-section profiles.

A near eye or heads up display system includes at least one light source, an imaging device, and an optical structure. The at least one light source can be, e.g., a red light source that produces light within a red wavelength range that has at least two different narrow bands of light having respective different emission peaks. The imaging device produces an image using light produced by the light source(s). The optical structure is configured to transfer light corresponding to the image from an input-pupil to an output-pupil where the image is viewable. By producing at least two different narrow bands of light having respective different emission peaks within a color (e.g., red) wavelength range, and taking advantage of chromatic dispersion, a more uniform intensity distribution is provided in the viewable image compared to if only one narrow band of light within the color wavelength range were produced.

An AR or VR display device. First and third input gratings receive light of a first color from first and second projectors, respectively, coupling the light into a first waveguide. Second and fourth input gratings receive light of a second color from the first and second projectors, respectively, coupling the light into a second waveguide. An output diffractive optical element couples light out of the waveguides towards a viewing position. The first and second projectors provide light to the input diffractive optical elements in directions that are at a first and second angle, respectively, to a waveguide normal vector. The output diffractive optical element couples light out of the waveguides in a first range of angles for light from the first projector and in a second range of angles for light from the second projector, the first range of angles and the second range of angles differing but partially overlapping.

An AR or VR display device. First and third input gratings receive light of a first color from first and second projectors, respectively, coupling the light into a first waveguide. Second and fourth input gratings receive light of a second color from the first and second projectors, respectively, coupling the light into a second waveguide. An output diffractive optical element couples light out of the waveguides towards a viewing position. The first and second projectors provide light to the input diffractive optical elements in directions that are at a first and second angle, respectively, to a waveguide normal vector. The output diffractive optical element couples light out of the waveguides in a first range of angles for light from the first projector and in a second range of angles for light from the second projector, the first range of angles and the second range of angles differing but partially overlapping.

A real-time wavelength correction system for visible light is co-operated with an optical system to make a parallel light beam split into a zero-order diffractive parallel light beam and a first-order diffractive parallel light beam. The zero-order diffractive parallel light beam focuses on a first back focal plane to form a first light spot. A drift of the first light spot is applied to determine an angular drift of the parallel light beam. The first-order diffractive parallel light beam is focused on a second back focal plane to form a second light spot. A drift of the second light spot is applied to determine an angular drift of the first-order diffractive parallel light beam. The angular drifts of the parallel light beam and the first-order diffractive parallel light beam, which are changed with real time temperature variation, are applied to correct the wavelength of the parallel light beam.