A diffusive film characterized with a directional property was developed. This new type of diffusive film is achieved
with a new technology derived from holography. Directionality of diffusive film is characterized because it diffuses the
light from the determinate angle strongly more than other angles.
This discriminative property is consequence of the diffusive film structure that consists of different index transparent
materials.
Additionally, The film is a volume type diffuser, and the surfaces are almost flat so it is possible to laminated it to
various part of other elements without remarkable affecting the diffusing properties of the film. Moreover, durability of
this film is actually enough to consumer applications.
With these remarkable properties, this diffusive film can widely applied to display systems etc.
A holographic 3D printer is a system that produces a direct hologram with full-parallax information using the 3-dimensional data of a subject from a computer. In this paper, we present a proposal for the reproduction of full-color images with the holographic 3D printer.
In order to realize the 3-dimensional color image, we selected the 3 laser wavelength colors of red (λ=633nm), green (λ=533nm), and blue (λ=442nm), and we built a one-step optical system using a projection system and a liquid crystal display. The 3-dimensional color image is obtained by synthesizing in a 2D array the multiple exposure with these 3 wavelengths made on each 250mm elementary hologram, and moving recording medium on a x-y stage. For the natural color reproduction in the holographic 3D printer, we take the approach of the digital processing technique based on the color management technology. The matching between the input and output colors is performed by investigating first, the relation between the gray level transmittance of the LCD and the diffraction efficiency of the hologram and second, by measuring the color displayed by the hologram to establish a correlation. In our first experimental results a non-linear functional relation for single and multiple exposure of the three components were found. These results are the first step in the realization of a natural color 3D image produced by the holographic color 3D printer.
In this report, new recording method of computer generated hologram (CGH) pattern is proposed. CGH pattern is generated as an optical interference fringe pattern with reference light like off-axis hologram. The object wave-front is realized by spatial light-phase modulator (SLPM). One of SLPMs is a liquid crystal panel device. Liquid crystal molecule has very high birefringent characteristics.
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