Recording of the Multiplexed Bragg Diffraction Gratings for Waveguides Using Phase Mask

Shishova, M. V.; Жердев, А. А.; Лушников, Д. С.; Одиноков, С. Б.

doi:10.3390/photonics7040097

Cited by 8 publications

(13 citation statements)

References 14 publications

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“…Thus, the recording angles are the diffraction angles of the recording beam on the phase mask. The method of angular multiplexing using a phase mask is described in detail in [11]. From the Bragg condition and the cosine connection of the VHG period d and the phase mask period ds, the following expressions are correct ( )…”

Section: Methodsmentioning

confidence: 99%

Selective Couplers Based on Multiplexed Volume Holographic Gratings for Waveguide Displays

et al. 2021

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Diffraction waveguides are widely used in augmented reality devices as information display systems for the introduction of data into the human visual field in order to supplement information about the world around us. This paper formulates the principles of radiation conversion in diffraction waveguides made of photo-thermo-refractive glass on the basis of multiplexed volume holographic gratings, and the advantages and disadvantages of high spectral-angular selectivity are analyzed. In the optical scheme, each of the superimposed volume holographic gratings in the diffraction waveguide forms a corresponding part of the composite angular field of view of the augmented reality device. A proposed mathematical model based on angular multiplexing made it possible to synthesize the diffraction optical element for a new type of diffraction waveguide made from photo-thermo-refractive glass and to create a prototype with an angular resolution of at least 3.0 ± 0.5′, with a brightness change in the image of less than 20% and with a composite angular field of view of 32°.

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Section: Methodsmentioning

confidence: 99%

Selective Couplers Based on Multiplexed Volume Holographic Gratings for Waveguide Displays

et al. 2021

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“…Similar to the case of the symmetrically arranged lenslet-array in Equations ( 8) and ( 9), the upper and lower bounds for the emission angle of voxel are expressed as Equation (11).…”

Section: Fabrication Of Full-color Holographic Waveguidementioning

confidence: 99%

“…See-through near-to-eye displays (NEDs), which are core components of the augmented reality (AR) headsets, have been given considerable attention recently [1,2]. Various optical technologies have been actively studied for the see-through AR NEDs, such as the free-form optics [3], the direct retinal projection optics [4,5], and the waveguide optics [6][7][8][9][10][11][12][13][14][15]. Among these technologies, the waveguide optics provide the best way to minimize the size of NEDs, which is crucial for the comfort and compactness of the AR headsets.…”

Section: Introductionmentioning

confidence: 99%

“…Among these technologies, the waveguide optics provide the best way to minimize the size of NEDs, which is crucial for the comfort and compactness of the AR headsets. Waveguide technologies can be categorized into three groups according to the types of couplers: geometric waveguides with the reflective couplers [6][7][8], the diffractive waveguide with the surface relief grating couplers [9], and the holographic waveguide with the holographic optical element (HOE) couplers [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The vergence-accommodation conflict (VAC), which represents a mismatch between the vergence distance and focal distance of human eye [16], may lead to visual discomfort, eye fatigue, and nausea. Unfortunately, for holographic waveguides, most studies have focused on presenting the virtual images at optical infinity [10][11][12], which causes the VAC problem. In this case, the waveguide structure and HOEs are optimized for the collimated light source.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crosstalk Reduction in Voxels for a See-Through Holographic Waveguide by Using Integral Imaging with Compensated Elemental Images

2021

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The representation of three-dimensional volumetric pixels, voxels, is an important issue for the near-to-eye displays (NEDs) to solve the vergence-accommodation conflict problem. Although the holographic waveguides using holographic optical element (HOE) couplers are promising technologies for NEDs with the ultra-thin structure and high transparency, most of them have presented only a single and fixed depth plane. In this paper, we analyze the imaging characteristics of holographic waveguides, particularly to represent the arbitrary voxels and investigate the voxel duplication problem arising from the non-collimated light from the voxels. In order to prevent the image crosstalk arising from the voxel duplication, we propose an adjustment method for the emission angle profile of voxels by using the integral imaging technique. In the proposed method, the sub-regions of elemental images, which correspond to the duplicated voxels, are masked in order to optimize the emission angle of integrated voxels. In the experimental verification, a see-through integral imaging system, based on the organic light-emitting diode display and a holographic waveguide with the thickness of 5 mm, was constructed. The fabricated HOE in the waveguide showed high diffraction efficiency of 72.8 %, 76.6%, and 72.5 % for 460 nm, 532 nm, and 640 nm lasers, respectively. By applying the masked elemental images, the proposed method resulted in a reduced crosstalk in the observed voxels by 2.35 times. The full-color experimental results of see-through holographic waveguide with integral imaging are provided, whereby the observed 3D images are presented clearly without the ghost images due to the voxel duplication problem.

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Binary Volume Acoustic Holograms

2023

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Recording of the Multiplexed Bragg Diffraction Gratings for Waveguides Using Phase Mask

Cited by 8 publications

References 14 publications

Selective Couplers Based on Multiplexed Volume Holographic Gratings for Waveguide Displays

Selective Couplers Based on Multiplexed Volume Holographic Gratings for Waveguide Displays

Crosstalk Reduction in Voxels for a See-Through Holographic Waveguide by Using Integral Imaging with Compensated Elemental Images

Binary Volume Acoustic Holograms

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