25 results about "Volume hologram" patented technology

The invention relates to polymerizable liquid crystal formulations (as a subcategory of liquid crystal material), especially to polymerizable ink formulations for inkjet printing, which are preferably PFAS-free (for enabling the reduction of perfluorocarbons and providing an environment friendly material), and which are comprising one or more polymerizable mesogenic compounds, also known as reactive mesogens (RMs), and one or more organic solvents selected from the group of aromatic ester and aromatic or aliphatic diester solvents, to polymers and polymer films obtained from such formulations, and to the use of the formulations, polymers and polymer films in optical or electrooptical components or devices, especially for digital optics or augmented reality or virtual reality (AR / VR) applications like polarizers, optical compensators, reflective films, diffraction or surface gratings, Bragg polarization gratings (Bragg PG), polarization volume gratings (PVG), polarization volume holograms (PVH), Pancharatnam Berry (PB) gratings, nonmechanical beam steering elements, optical waveguides, optical couplers, optical combiners, polarization beam splitters, partial mirrors, lenses or PB lenses.

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.

The invention relates to polymerizable liquid crystal compositions (as a subcategory of liquid crystal materials) comprising an alignment additive, which are preferably PFAS-free (for enabling the reduction of perfluorocarbons and providing an environment friendly material), to formulations, polymers and polymer films obtained from such compositions, and to the use of the compositions, formulations, polymers and polymer films in optical or electrooptical components or devices, especially for digital optics or augmented reality or virtual reality (AR / VR) applications like polarizers, optical compensators, reflective films, diffraction or surface gratings, Bragg polarization gratings (Bragg PG), polarization volume gratings (PVG), polarization volume holograms (PVH), Pancharatnam Berry (PB) gratings, nonmechanical beam steering elements, optical waveguides, optical couplers, optical combiners, polarization beam splitters, partial mirrors, lenses or PB lenses.

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).

To provide an exit pupil expanding optical element with a large output part and high diffraction efficiency at the input part, and a display device using the same.SOLUTION: The exit pupil expansion element includes: a waveguide part 50 that is configured as a flat plate and guides light L2; an incident part 31 for directing light into the waveguide; an emission part 32 that is located on the waveguide part, in which exit apertures 3221 and 3222 are divided into multiple sections through which the light entered from the incident part and guided within the waveguide part is emitted. The incident part includes a relief-type diffraction grating 311 that is arranged to bend the light entering the incident part into the waveguide part. The emission part includes a volume holographic diffraction grating 321 that is arranged to emit a portion of the light guided within the waveguide from each of the multiple exit apertures.SELECTED DRAWING: Figure 3

The present invention relates to reactive mesogens (RMs) with high birefringence and low absorption, RM mixtures and formulations comprising such RMs (as subspecies of liquid crystal materials), polymers and polymer films obtained from such RMs and RM mixtures, and the use of such RMs, RM mixtures, formulations, polymers and polymer films in optical or electro-optical components or devices, this use is particularly for digital optical or augmented reality or virtual reality (AR / VR) applications such as polarizers, optical compensators, reflective films, diffractive or surface gratings, Bragg polarization gratings (Bragg PG), polarized volume gratings (PVG), polarized volume holograms (PVH), Pangulamm-Bell (PB) gratings, optical waveguides, lenses or PB lenses.

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.

An image display device in which dark lines and discoloration do not occur in the central portion of the field of view in the image projected on the retina. The present technology provides an image display device. The image display device includes a first reflection type volume hologram and a second reflection type volume hologram forming a transmission type diffraction element as a whole. The first reflection type volume hologram and the second reflection type volume hologram satisfy the Bragg condition for incident light of three colors of red, green, and blue. The first reflection type volume hologram diffracts incident light incident at an incident angle θi at a connection angle θc and deflects the incident light to the second reflection type volume hologram. The second reflection type volume hologram condenses the deflected incident light. The incident angle θi and the connection angle θc satisfy a specific condition.

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.

To provide interlayers that provide desirable optical properties when incorporated into laminates containing a holographic optical element(s) (HOEs), and that maintain and do not impair properties of the HOE film.SOLUTION: A manufacturing process comprises the steps of: providing a first polymer layer comprising a low refractive index compound and a polymeric volume hologram; combining the first polymer layer and the polymeric volume hologram to form a combined layer; providing at least a first substrate; and laminating the combined layer and the at least first substrate to form a laminated structure. The first substrate is adjacent to the first polymer layer. The laminated structure has partitioned low refractive index compound levels within the polymeric volume hologram such that the light modification properties of the polymeric volume hologram following lamination and equilibration of the low refractive index compound with the polymer interlayer are greater than 70% of the magnitude of the original light modification properties of the polymeric hologram prior to the combination in at least one wavelength range.SELECTED DRAWING: Figure 1

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.

The display may include a waveguide that directs light towards an eye box. The waveguide may include first and second media layers that are edge-coupled at an interface. The first media layer may include a louvered mirror cross-coupler that redirects the light towards the second media layer. The second media layer may include a volume hologram output coupler that couples the light out of the waveguide. Additional layers may be interposed between the first media layer and waveguide substrates. The additional layers may help confine the light within the first media layer as the light propagates such that all of the light enters the second media layer through the interface. This may configure the waveguide to occupy a minimal amount of space within the display while also providing the eye box with as bright and uniform an image as possible.

To provide an exposure device capable of preventing a decrease in the diffraction efficiency of the first holographic optical element being manufactured.SOLUTION: An exposure device in an embodiment includes: a laser light source 1 that emits laser light L2, L5; and a detector that detects the exposure condition on a first volume hologram 9 to be exposed by the laser light L2 and L5. The laser light L2, L5 is diffracted towards the detector by a second volume hologram 10.SELECTED DRAWING: Figure 1

A method for making an optical grating having a non-uniform refractive index profile along a direction substantially perpendicular to a plane defined by the optical grating includes placing a layer of photopolymerization material having a first surface and a second surface that is opposite to the first surface between a first material transfer layer and a second material transfer layer so that the first surface of the layer of photopolymerization material is in contact with the first material transfer layer and the second surface of the layer of photopolymerization material is in contact with the second material transfer layer to allow material transfer between the layer of photopolymerization material and the first and second material transfer layers by diffusion.

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.