Citation:

Holographic augmented reality display with conical holographic optical element for wide viewing zone

• Light: Advanced Manufacturing  3, Article number: 12 (2022)
• Corresponding author:

Yusuke Sando (sando@tri-osaka.jp)

Revised: 10 February 2022
Accepted: 15 February 2022
Accepted article preview online: 22 February 2022
Published online: 02 March 2022
• In this study, we propose a holographic augmented reality (AR) display with a wide viewing zone realized by using a special-designed reflective optical element. A conical holographic optical element (HOE) is used as such a reflective optical element. This conical HOE was implemented to reconstruct a diverging spherical wave with a wide spread angle. It has a sharp wavelength selectivity by recording it as a volume hologram, enabling augmented reality (AR) representation of real and virtual 3D objects. The quality of the generated spherical wave and the spectral reflectivity of the fabricated conical HOE were investigated. An optical superimposition between real and virtual 3D objects was demonstrated, thereby enhancing the validity of our proposed method. A horizontal viewing zone of 140° and a vertical viewing zone of 30° were experimentally confirmed. The fabrication procedure for the conical HOE is presented, and the calculation method of the computer-generated hologram (CGH) based on Fermat’s principle is explained in detail.
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通讯作者: 陈斌, bchen63@163.com
• 1.

沈阳化工大学材料科学与工程学院 沈阳 110142

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Research Summary

Surrounding viewing zone: Beyond the limitation of planar holograms

Holographic displays are expected for futuristic 3D displays. One problem to its practical application is the narrow viewing zone. No sufficient motion parallax is realized at present. One reason for the narrow viewing zone stems from the shape of holograms, and conventional planar hologram cannot provide surrounding viewing zone. This study presents a new technique to overcome this limitation. In this study, a conical holographic optical element (HOE) is placed after the hologram modulation.  Because the conical HOE generates a widely diverging spherical wave, the viewing zone can be enlarged. Moreover, by using the sharp wavelength selectivity of the HOE, augmented reality (AR) representation is also feasible. The optical experiment has successfully demonstrated the wide viewing zone of 140◦ and 30◦ in the horizontal and vertical directions, respectively.

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Holographic augmented reality display with conical holographic optical element for wide viewing zone

• 1. Osaka Research Institute of Industrial Science and Technology, 2-7-1 Ayumino, Izumi, Osaka 594-1157, Japan
• 2. Center for Optical Research & Education, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
• 3. Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
• Corresponding author: Yusuke Sando, sando@tri-osaka.jp;

Abstract: In this study, we propose a holographic augmented reality (AR) display with a wide viewing zone realized by using a special-designed reflective optical element. A conical holographic optical element (HOE) is used as such a reflective optical element. This conical HOE was implemented to reconstruct a diverging spherical wave with a wide spread angle. It has a sharp wavelength selectivity by recording it as a volume hologram, enabling augmented reality (AR) representation of real and virtual 3D objects. The quality of the generated spherical wave and the spectral reflectivity of the fabricated conical HOE were investigated. An optical superimposition between real and virtual 3D objects was demonstrated, thereby enhancing the validity of our proposed method. A horizontal viewing zone of 140° and a vertical viewing zone of 30° were experimentally confirmed. The fabrication procedure for the conical HOE is presented, and the calculation method of the computer-generated hologram (CGH) based on Fermat’s principle is explained in detail.

Research Summary

Surrounding viewing zone: Beyond the limitation of planar holograms

Holographic displays are expected for futuristic 3D displays. One problem to its practical application is the narrow viewing zone. No sufficient motion parallax is realized at present. One reason for the narrow viewing zone stems from the shape of holograms, and conventional planar hologram cannot provide surrounding viewing zone. This study presents a new technique to overcome this limitation. In this study, a conical holographic optical element (HOE) is placed after the hologram modulation.  Because the conical HOE generates a widely diverging spherical wave, the viewing zone can be enlarged. Moreover, by using the sharp wavelength selectivity of the HOE, augmented reality (AR) representation is also feasible. The optical experiment has successfully demonstrated the wide viewing zone of 140◦ and 30◦ in the horizontal and vertical directions, respectively.

show all
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