The paper presents an augmented reality display based on the free-space combiner, consisting of two holographic mirrors: flat and spherical. A feature of such a system is a high-reflection coefficient of mirrors up to 90% for one wavelength and a high transmittance to the lumen up to 67% throughout the rest of the visible spectrum, unlike similar solutions implementing principles of polarization or dichroic beam splitting. The recording scheme and calculation of a separate flat holographic mirror and spherical holographic mirror are described. The proposed augmented reality display can provide multifocality, i.e., reproduction of virtual images at several distances, which demonstrates a certain perspective of this implementation in terms of compensation for the vergence accommodation conflict.

An experimental study of the color reproduction quality of RGB color components, white and some "composite" colors in the developed augmented reality device based on two waveguides with diffraction elements was carried out. The color gamut of the device is determined. Color characteristics were analyzed by color coordinates in the xy system, presented on the chromatic diagram, and are given in the work.

The article describes the variants for using the relief phase diffraction gratings for a waveguide used as an optical input/output element for images in augmented reality systems. A characteristic feature of diffraction gratings with a surface relief, which, in this case, were recorded in the photoresist layer, is a relatively small relief depth (of the order of several tenths of a micrometer), while the diffraction efficiency of such gratings is quite high (up to 30%). The paper considers an implementation option for a waveguide with a common angular field of view close to 60 degrees. The article presents the waveguide options used to output both monochrome images and display full-color images.

The possibility of copying high-frequency diffraction gratings obtained in a photoresist layer to glass substrates using polymer compositions (“OKM” and “Tekhnovit”) is shown and their comparative analysis is carried out. The mechanism of copying the relief-phase structure is based on a two-stage process consisting of the following steps: obtaining a nickel master, applying a polymer composition to it and curing under the influence of UV radiation. The copying modes were optimized (time, exposure, thickness of the polymer base), and that allowed to obtain relief phase diffraction gratings with a surface relief depth comparable with the initial structure obtained in the photoresist layer. The diffraction efficiency of the resulting gratings was estimated, as well as the change in the depth of the surface relief of polymer copies obtained from one master.

An augmented reality display based on a planar waveguide made in photo-thermo-refractive glass had been demonstrated. The monolithic integration of multiplexed volume Bragg gratings with the waveguide platform provided in/out-coupling and image transmission from a portable projector. Design and calculation of the grating configuration was performed. The optical replication method was simulated and implemented for manufacturing the multiplexed coupling elements. Resulted field of view was limited by the projection system of the prototype, however can be expanded beyond 50o.

This paper examines the feasibility of producing multiplexed Bragg gratings for use as diffractive optical elements (DOEs) by coherent optical replication of a surface-relief phase grating into thick-film photosensitive materials. The use of such DOEs in light guide plates (LGPs) for optical imaging systems ensures energy-efficient light input into and output from LGPs and allows one to minimise their weight and size. We present simulation results for the interference structure fabrication process and recording of a series of multiplexed diffraction gratings in photosensitive materials.

The possibility of replication of high-frequency diffraction gratings obtained in a photoresist layer to glass substrates using polymer compositions (OKM and Technovit) is shown and their comparative analysis is carried out. The replication mechanism of the relief-phase structure is based on a two-stage process, which consists in obtaining a nickel master element, followed by applying a polymer composition to it and curing it under the influence of UV radiation. The replicating regimes were optimized (time, exposure, thickness of the polymer base), which made it possible to obtain relief phase diffraction gratings with a depth of surface relief comparable with the initial structure obtained in the photoresist layer. The diffraction efficiency of the resulting gratings was estimated, as well as the change in the depth of the surface relief of polymer copies obtained from one master element.

The present article is dedicated to the problem of computer-generated holograms application for measurement of optical wavefront curvature with high precision. A holographic wavefront sensor scheme based on a phase-only spatial light modulator, which is used for CGH displaying, is proposed. The presented optical scheme and processing algorithm are validated with numerical simulations and experimental modelling.

This paper analyses the possibility of obtaining a full color image using the holographic indicator based on a light guide plate with diffractive optical elements (DOEs). The parameters of the optical collimator system are calculated as well as the experimental results on generation of full color images are presented.

A holographic wavefront sensor scheme using a phase-only spatial light modulator (SLM) with reduced cross-talk noise influence is proposed. A novel method for plane wave aberration measuring using a phase-only computer-generated hologram is devised. The proposed scheme and algorithm are validated with numerical simulations and experiments.

Hologram optical filters have been developed that make it possible to implement the wave -front decomposition for further analysis and calculation of aberrations. The implementation of hologram filters in both a photosensitive material and in digital form using phase spatial light modulators is considered. The obtained results can be used for the analysis of distorted wavefront in the problem of the laser beam control.

The work is devoted to the calculation of the optimal parameters of diffraction gratings for input and output of radiation from the holographic lightguides for augmented reality glasses. Two main stages can be distinguished, namely: the calculation of the grating's period in each of the optical lightguides to obtain a multicolor image in a large field of view, and the calculation of the height of the relief profile (to maximize the diffraction efficiency).

A combination of diffractive optical elements for monochrome information virtual indicators is described. To reduce the spectral "blurring" of image in monochrome indicators with OLED-display or LCD-display with LED backlight the possibility of using the volume reflection hologram as a spectral filter is investigated. The theoretical and experimental results show that the volume reflection hologram can be used as part of a monochrome virtual indicator containing OLED-, LCOS- or LCD-display with LED-backlight and relief-phase gratings for output of radiation from substrate to reduce the spectral "blurring" of image.

Objectives: This paper presents several variants of stable optical schemes of sight with Holographic Optical Element to solve a problem of changing direction of diffracted by it. Methods/Statistical Analysis: Optical scheme of holographic sight is presented where the transmission hologram together with mirror is working like the reflection one. Transmission hologram with mirror can be used to stabilize beam position for much bigger wavelength shift, than it is possible with reflection hologram. Findings: Results of calculations show that using of optical systems with a mutually inclined HOE and ADG allows reducing size of scheme with acceptable shift of image. Also it should be noted that the beneficial properties of reflection holograms can be realized using transmission holograms. Application/Improvements: Our results can be useful in devices with Holographic Optical Elements such as display systems and especially for development of holographic sight. Keywords: Diffraction, Holography, Holographic Sight

Combined holographic optical elements for optical systems of multicolor character/symbol display devices are described. This element combines the functions of four-level diffractive optical elements with high diffraction efficiency and spectral plasmon filters with a variable bandwidth depending on the incidence angle. The theoretical studies suggest the feasibility of combining the two types of elements in a single structure.

The possibility of formation of the image in the form of five cross-located points by means of diffraction optical elements (DOE), containing five phase diffraction gratings with rectangular profile, which are working in the second order of diffraction at tilted incidence of the light, occupying total not more than 1% of the area of the DOE. The possibilities of manufacturing a DOE using the “Caroline 15 PE” plasma-chemical etching (PCE) machine are considered. It is established, that on the up to 1,4 mm deepness of surface micro-relief on optical glass and tilted incidence of light, the diffraction efficiency of DOE up to 0,3 – 0,35 on the second order of diffraction is achieved.

Актуальной является задача использования в производстве интегральных микросхем оптико-электронного голографического нанолитографа, позволяющего обеспечить ширину линий в несколько нанометров. Основой данного литографа является проекционная система, позволяющая уменьшить с требуемой кратностью изображение, считываемое с пространственного модулятора света.