16 results about "Volume hologram" patented technology

To provide a hologram device capable of accurately reproducing a reproduced image.SOLUTION: A hologram device (15) includes a holographic color filter (10) composed of a reflection type volume hologram, and a transmission type computer-generated hologram (11) disposed in front of the holographic color filter so as to overlap the holographic color filter.SELECTED DRAWING: Figure 3

The present disclosure provides a volume hologram laminate comprising a substrate, and a volume hologram laminate portion placed on one surface of the substrate, wherein the volume hologram laminate portion includes, from a substrate side, a resin layer including transparent resin; an inhibiting layer placed in a pattern form, in contact with the resin layer; and a volume hologram layer, on which an interference fringe is recorded, placed in contact with the resin layer and the inhibiting layer, in this order, and an inhibiting layer-formed region including the inhibiting layer and an inhibiting layer-non-formed region including no inhibiting layer differ in a color of a reproduction image from the volume hologram layer.

To accurately measure the diffraction efficiency of holographic optical elements during exposure. [Solution] An exposure apparatus used to expose a volume hologram 5 comprises a laser light source 6 that irradiates the volume hologram 5 with first light, which is light in a predetermined wavelength band, in order to detect the diffraction efficiency of the volume hologram 5 during exposure, a power meter 8 that detects the amount of light of the first light, and a power meter 9 that detects the amount of light of the second light, which is the first light diffracted by the volume hologram 5.

The present invention relates to an exposure apparatus, an exposure method, a manufacturing apparatus for a holographic optical element, and a manufacturing method for a holographic optical element. The present invention accurately measures diffraction efficiency of a holographic optical element during an exposure process. An exposure apparatus for exposing a volume hologram (5) includes a laser light source (6) for irradiating the volume hologram (5) with light of a prescribed wavelength band, i.e., first light, in order to detect diffraction efficiency of the volume hologram (5) during the exposure process; a power meter (8) for detecting an amount of light of the first light; and a power meter (9) for detecting an amount of light of second light diffracted by the volume hologram (5).

Techniques for designing a lightweight and small footprint display (eyewear) device are described. In order to reduce the cost, weight and volume of the display device, only one imager is used. An optical engine (cube) is provided to divide an optical image from the imager into a first (left) portion and a second (right) portion. Each of the portions is redirected to a predefined path via one or more optical lenses, where in one embodiment, the optical lenses are based on polarizing volume holography (PVH) lenses, all of which have different optical characteristics to diffract the light beam at a predefined angle.

The present invention relates to an optical element comprising a chiral liquid crystal (LC) polymer film as a sub-class of liquid crystal materials, a method for the production thereof and the use of the optical element as a diffractive optical element in optical or electro-optical components or devices, in particular for digital optical or augmented reality or virtual reality (AR / VR) applications, such as a polarizer, an optical compensator, a reflective film, a diffraction grating or surface grating, a Bragg polarization grating (Bragg PG), a polarization volume grating (PVG), a polarization volume hologram (PVH), a Pangulam-Bell (PB) grating, a non-mechanical beam steering element, an optical waveguide, an optical coupler, an optical combiner, a polarization beam splitter, a partial mirror or a lens.

The present invention relates to an exposure apparatus, an exposure method, a manufacturing apparatus for a holographic optical element, and a manufacturing method for a holographic optical element. The present invention produces a holographic optical element having a set diffraction efficiency. An exposure apparatus for exposing a volume hologram includes a laser light source for irradiating a volume hologram with light of a prescribed wavelength, i.e., first light, for detecting a first diffraction efficiency of the volume hologram during exposure; a power meter for detecting the amount of light of the first light; a power meter for detecting the amount of light of second light diffracted by the volume hologram; a prediction device for calculating the first diffraction efficiency based on the detection results of the power meters, and predicting a second diffraction efficiency of the volume hologram after exposure is stopped based on the calculated first diffraction efficiency; and a control device for controlling an adjusting device based on the prediction results, the adjusting device adjusting the amount of light of the laser light source, which irradiates third light for exposing the volume hologram.

The present invention provides an optical element containing a chiral LC polymer film. [Solution] The present invention relates to optical elements comprising chiral liquid crystal (LC) polymer films (as a subcategory of liquid crystal materials), methods for manufacturing the same, and the use of the same as a diffractive optical element in optical components or electro-optical components or devices, particularly for digital optical systems or augmented reality or virtual reality (AR / VR) applications, such as polarizers, optical compensators, reflective films, diffraction gratings or surface gratings, Bragg polarizing gratings (Bragg PG), polarizing volume gratings (PVG), polarizing volume holograms (PVH), Pancharatnam Berry (PB) gratings, non-mechanical beam steering elements, optical waveguides, optical couplers, optical combiners, polarizing beam splitters, partial mirrors or lenses.

Disclosed is a method of determining phase aberration in a given wavefront. The method includes recording a current array of holograms on a photosensitive recording medium, wherein the recording comprises recording a first pair of multiplexed volume holograms with respective first and second carrier spatial frequencies, on the photosensitive recording medium, rotating the photosensitive recording medium by 90°, recording a next pair of multiplexed volume holograms with respective first and second carrier spatial frequencies, and form the current array of holograms, probing the current array of holograms with the given wavefront to generate a plurality of first order diffracted beams and a weak transmitted zero order beam. The method further includes capturing an image of the plurality of first order diffracted beams and the weak transmitted zero order beam by a detector, and zonally determining the phase aberration of the given wavefront based on comparison of intensity values of the plurality of first order diffracted beams.

Volume hologram couplers are multiplexed into a same volume to increase the field of view of components in a waveguide assembly such as an augmented reality (AR) waveguide assembly for use in electronic eyewear devices. The multiplexing can be done in any direction perpendicular to the optical axis. Multiplexing of the volume hologram couplers combines different functions of the waveguide assembly into one diffractive optical element (DOE) in the form of an input coupler or an output coupler. For example, each volume holographic grating of input couplers and output couplers has a different refraction angle, a different periodicity, or both relative to any other volume holographic grating in the same volume. The resulting DOEs reduce reinteraction losses, reduce thickness, reduce the amount of DOEs and the number of layers and airgaps, and increase robustness (volume versus surface relief that can scratch or break).

Techniques for optical waveguides with multiple layers in a stack arrangement are described herein. In an example, an optical waveguide system includes a waveguide substrate, a first holographic optical element, a second holographic optical element, and an optical de-coupling layer. The first holographic optical element includes a first photopolymer layer and excluding a first polymer substrate and the second holographic optical element includes a second photopolymer layer. The first photopolymer layer is attached to the waveguide substrate and to either the second holographic optical element or the optical de-coupling layer.

The invention relates to a half-wave plate comprising two layers of chiral liquid crystal (LC) polymers (which are subclasses of liquid crystal materials) with pitch gradients; a preparation method thereof; the invention also relates to the use thereof as a diffractive optical element in optical or electro-optical components or devices, in particular for digital optical or augmented reality or virtual reality (AR / VR) applications, such as a polarizer, an optical compensator, a reflective film, a diffraction grating or surface grating, a Bragg polarization grating (Bragg PG), a polarization volume grating (PVG), a polarization volume hologram (PVH), a Pangulam-Bell (PB) grating, a non-mechanical beam steering element, an optical waveguide, an optical coupler, an optical combiner, a polarization beam splitter, a partial mirror or a lens.

The present invention relates to chiral reactive mesogen (RM) mixtures and formulations comprising the same (as a subclass of liquid crystal materials), preferably PFAS-free (for enabling the reduction of perfluorocarbon compounds and the provision of environmentally friendly materials), to polymers and polymer films obtained from such chiral RM mixtures, and the use of the chiral RM mixtures, formulations, polymers and polymer films in optical or electro-optical components or devices, in particular for digital optical or augmented reality or virtual reality (AR / VR) applications, such as a polarizer, an optical compensator, a reflective film, a diffractive or surface grating, a Bragg polarization grating (Bragg PG), a polarization volume grating (PVG), a polarization volume hologram (PVH), a Pangulam-Bell (PB) grating, a non-mechanical beam directing element, an optical waveguide, an optical coupler, an optical combiner, a polarization beam splitter, a partial mirror or a lens.

Create a holographic optical element with the specified diffraction efficiency. [Solution] An exposure apparatus used to expose a volume hologram 5, comprising: a laser light source 6 that irradiates the volume hologram 5 with first light, which is light in a predetermined wavelength band, in order to detect the first diffraction efficiency of the volume hologram 5 during exposure; a power meter 8 that detects the amount of light of the first light; a power meter 9 that detects the amount of light of the second light, which is the first light diffracted by the volume hologram 5; a prediction device that calculates the first diffraction efficiency based on the detection results of the power meters 8 and 9 and predicts the second diffraction efficiency, which is the diffraction efficiency of the volume hologram 5 after exposure is stopped, according to the calculated first diffraction efficiency; and a control device 10 that controls an adjustment device that adjusts the amount of light of the laser light source 1 that irradiates the volume hologram 5 with third light for exposure according to the prediction result.

To produce a holographic optical element with a set diffraction efficiency.An exposure apparatus used for exposing a volume hologram to light includes a laser light source that irradiates the volume hologram with first light which is light with a predetermined wavelength range in order to detect a first diffraction efficiency of the volume hologram during exposure, a power meter that detects the amount of first light, a power meter that detects the amount of second light which is the first light diffracted by the volume hologram, a prediction device that calculates the first diffraction efficiency based on detection results of the power meters and predicts a second diffraction efficiency which is the diffraction efficiency of the volume hologram after stop of the exposure according to the calculated first diffraction efficiency, and a control device that controls, according to a prediction result, an adjustment device that adjusts the amount of light from a laser light source that emits third light to which the volume hologram is to be exposed.

To accurately measure the diffraction efficiency of a holographic optical element during exposure.An exposure apparatus used for exposing a volume hologram to light includes a laser light source that irradiates the volume hologram with first light which is light with a predetermined wavelength range in order to detect the diffraction efficiency of the volume hologram during exposure, a power meter that detects the amount of first light, and a power meter that detects the amount of second light which is the first light diffracted by the volume hologram.