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ISSN: 1023-5086

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ISSN: 1023-5086

Scientific and technical

Opticheskii Zhurnal

A full-text English translation of the journal is published by Optica Publishing Group under the title “Journal of Optical Technology”

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DOI: 10.17586/1023-5086-2023-90-08-29-43

УДК: 535.42; 778.38

Recording and reconstruction distortion of off-axis hologram focusing mirror in augmented reality displays

For Russian citation (Opticheskii Zhurnal):

Путилин Н.А., Дубынин С.Е., Путилин А.Н., Копёнкин С.С., Бородин Ю.П. Искажения записи и воспроизведения внеосевых голограммных фокусирующих зеркал в схемах дисплеев дополненной реальности // Оптический журнал. 2023. Т. 90. № 8. С. 29–43. http://doi.org/10.17586/1023-5086-2023-90-08-29-43

 

Putilin N.A., Dubynin S.E., Putilin A.N., Kopenkin S.S., Borodin Yu.P. Recording and reconstruction distortion of off-axis hologram focusing mirror in augmented reality displays [in Russian] // Opticheskii Zhurnal. 2023. V. 90. № 8. P. 29–43. http://doi.org/10.17586/1023-5086-2023-90-08-29-43

For citation (Journal of Optical Technology):
Nikolay Putilin, Sergey Dubynin, Andrey Putilin, Sergey Kopenkin, and Yuriy Borodin, "Recording and reconstruction distortion of an off-axis hologram focusing mirror in augmented reality displays," Journal of Optical Technology. 90(8), 435-443 (2023). https://doi.org/10.1364/JOT.90.000435
Abstract:

Subject of study. Off-axis wide-aperture hologram focusing mirror and distortions that occur during its recording and playback in augmented reality display circuits. Aim of study. Experimental determination of the adequacy of the geometric optics approximation in the non-axial holographic focusing mirror modeling, determination of the sources and types of distortion. Method. At the first stage the computer modeling in Zemax and in specially created programs based on MATLAB was used. The comparison of the distributions of local periods for holographic focusing mirror recording on the finite thickness substrates and on an extremely thin substrate was made. At the second stage an experimental study of the recorded holographic focusing mirror was carried out. Two playback schemes were considered — "from point to point" (the scheme of reconstruction is similar to the recording scheme) and a scheme with the virtual image reconstruction on the infinity. The shapes and structure of the reconstructed focal points formed by the holographic focusing mirror were studied, the images were projected directly onto the CMOS photodetector. Main results. It has been defined that the irreversible distortions occur during the reconstruction of the holographic high aperture lenses due to the substrates of finite thickness influence. The homocentric reference and signal beams were used for the holographic focusing mirrors recording. In addition, it was defined that the virtual image reconstruction scheme causes considerable distortions. The approximation of geometric optics gives quite good results for describing the operation of non-axial holographic lenses in the schemes of augmented reality displays. However, it is necessary to take into account the finite thicknesses of the substrates, as well as the shrinkage of the recording medium. Practical significance. The results of the study can be used in the development of compact wide-aperture augmented reality displays. The applied approximations allow us to use them in the practical development of the optical systems for augmented reality displays. Taking into account the finite thicknesses of the substrates can improve the quality of the generated virtual image.

Keywords:

holographic optical elements, holographic distortions, augmented reality

Acknowledgements:
the team of authors expresses gratitude to the Samsung Research Center for long-term and effective cooperation

OCIS codes: 090.2820, 090.2890.

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