KEYWORDS: Holograms, Signal to noise ratio, Holography, Data storage, CMOS sensors, Glasses, Optical design, Scattering, Digital micromirror devices, Objectives
The recording property of newly developed photo-polymer for Holographic data storage (HDS) was studied. We designed two types of photo-polymers; Type-A and Type-B. Type-A is developed to be suitable for the collinear system. Type-B is designed by using conventional technology. The dependence of recording property on write energy was investigated. It was found that Type-A had higher sensitivity (0.16mJ/cm2), which indicated the capability of recording by a few pulse exposure, and lower scattering property. We also investigated recording property of shift multi-plexing.
We present a new type of photopolymer system for recording reflection holograms. The photopolymer system using radical and cationic photopolymerization controlled by the wavelength of light gives us enhanced diffraction efficiencies and a balanced recording sensitivity (20 approximately 60 mJ/cm2) in the blue to red region of the spectrum. In color hologram recordings, diffraction efficiencies of around 60% are obtained when using a photopolymer film composed of different spectral-sensitive photopolymer layers.
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