Daisuke Barada
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View article: Holographic augmented reality display with conical holographic optical element for wide viewing zone
Holographic augmented reality display with conical holographic optical element for wide viewing zone Open
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 optic…
View article: Color image reflection by using parabolic cylindrical volume holographic mirror
Color image reflection by using parabolic cylindrical volume holographic mirror Open
In this study, we prepared a cylindrical wave diffractive optical element that diffracts color images using volume hologram technology to improve the performance and cost of HMDs.
View article: Spatial phase shaping of ultrashort laser pulses to overcome the diffraction limit
Spatial phase shaping of ultrashort laser pulses to overcome the diffraction limit Open
Focused beam shaping is very effective in material laser processing, optical tweezers, and laser microscopy. In particular, size minimization of shaped beams has attracted much attention because it is directly connected to the performance …
View article: Super-wide viewing-zone holographic 3D display using a convex parabolic mirror
Super-wide viewing-zone holographic 3D display using a convex parabolic mirror Open
To enlarge both horizontal (azimuthal) and vertical (zenithal) viewing zones simultaneously, a convex parabolic mirror is placed after passing through the hologram. Viewers perceive a three-dimensional (3D) object inside the parabolic mirr…
View article: Orthogonal polarization encoding for reduction of interpixel cross talk in holographic data storage
Orthogonal polarization encoding for reduction of interpixel cross talk in holographic data storage Open
Interpixel cross talk decreases the quality of a reconstructed signal in holographic data storage and imposes a limitation on its storage capacity. To reduce the interpixel cross talk, an orthogonal polarization encoding method is proposed…
View article: Azo-polymer film twisted to form a helical surface relief by illumination with a circularly polarized Gaussian beam
Azo-polymer film twisted to form a helical surface relief by illumination with a circularly polarized Gaussian beam Open
A helical surface relief can be created in an azo-polymer film simply by illuminating circularly polarized light with spin angular momentum and without any orbital angular momentum. The helicity of the surface relief is determined by the s…