An optical article including a substrate, and a holographic waveguide covering at least part of the substrate and including two main surfaces, at least one of them conforming to a surface of the substrate, and at least first and second zones that are configured so that light incoming on one of the first and second zones is at least partially guided towards the other of the first and second zones.

A fingerprint sensor integrated display using a holographic optical element and a recording and reconstruction method of the holographic optical element are disclosed. The fingerprint sensor integrated display includes a display panel on which an input image is displayed, a transparent substrate disposed on the display panel, and a light entering element configured to irradiate light from a light source onto the transparent substrate. A particular type of visual information is reconstructed through a holographic element at a location of the light entering element.

Several unique configurations for interferometric recording of volumetric phase diffractive elements with relatively high angle diffraction for use in waveguides are disclosed. Separate layer EPE and OPE structures produced by various methods may be integrated in side-by-side or overlaid constructs, and multiple such EPE and OPE structures may be combined or multiplexed to exhibit EPE/OPE functionality in a single, spatially-coincident layer. Multiplexed structures reduce the total number of layers of materials within a stack of eyepiece optics, each of which may be responsible for displaying a given focal depth range of a volumetric image. Volumetric phase type diffractive elements are used to offer properties including spectral bandwidth selectivity that may enable registered multi-color diffracted fields, angular multiplexing capability to facilitate tiling and field-of-view expansion without crosstalk, and all-optical, relatively simple prototyping compared to other diffractive element forms, enabling rapid design iteration.

The present invention relates to a photopolymer composition comprising a photopolymerizable component and a photoinitiator system comprising a chain-substituted cyanine dye. The invention further provides a photopolymer comprising a photopolymer composition according to the invention, a holographic medium comprising a photopolymer according to the invention, the use of a holographic medium according to the invention, and a process for producing a holographic medium by using the photopolymer according to the invention and the exposure of the corresponding holographic medium with the aid of pulsed laser radiation.

The present invention features VHOEs with expanded acceptance angle ranges as well as various systems and methods for fabricating VHOEs with expanded acceptance angle ranges. The VHOE with expanded acceptance angle range may include two or more individual Bragg gratings. In preferred embodiments, the two or more individual Bragg gratings have the same diffraction geometry but with shifted Bragg conditions. Having the same diffraction geometry means when light is incident on the VHOE including two or more individual Bragg gratings, the diffracted light from each of the Bragg gratings is co-linear or overlapping with the diffracted light from the other Bragg gratings. The Bragg condition for each of the Bragg gratings are shifted with respect to each neighboring Bragg grating by an amount up to the acceptance angle range of each individual Bragg grating.

An optical device includes: a light guide plate receiving, for each of N types of wavelength bands, a plurality of parallel light beams with different incident angles each corresponding to view angles, and guiding the received parallel light beams; a first and a second volume hologram gratings of reflection type having a diffraction configuration which includes N types of interference fringes each corresponding to the N types of wavelength bands, and diffracting/reflecting the parallel light beams. The optical device satisfies for each wavelength band, a relationship of P>L, where L represents a central diffraction wavelength in the first and second volume hologram gratings, defined for a parallel light beam corresponding to a central view angle, and P represents a peak wavelength of the parallel light beams.

A backlight device, a holographic display that includes the backlight device, and a method of manufacturing a holographic optical element are provided. The backlight device includes a light guide plate configured to guide light emitted by a light source, a first holographic optical element configured to expand light that has propagated through the light guide plate and that has a multi-layered structure, and a second holographic optical element configured to concentrate light reflected by the first holographic optical element.

A system and method of performing incoherent light treatment is disclosed. The method may include securing a recording medium to a securing structure within an internal cavity and delivering light at least partially toward a baffle disposed within the internal cavity. The method may also include securing one or more diffusers to one or more surfaces of the recording medium.

Provided is a digital holographic image-taking apparatus, including: an illumination portion (10) having a light emission surface (14D) for emitting illumination light toward an object (1), the illumination light having a specific wavelength in a coherent plane waveform; and an image sensor (50) having an pixel array (51) including two-dimensionally arranged pixels, the image sensor (50) capturing an interference pattern generated based on the illumination light having acted on the object (1), in which the following conditional expression is satisfied: 0.0000001<Z.sup.2/S<16, where S represents the area of the light emission surface (14D), and Z represents the distance from the light emission surface (14D) to the pixel array (51).

A manufacturing method of an optical element applied to a miniature microscope includes the steps of: emitting a signal light and a reference light to an optical material; and forming a plurality of gratings on the optical material by interfering the signal light and the reference light. A miniature microscope is also disclosed.