Study Of Holographic Data Storage Characteristics Of The Novel Broadband Sensitive Potopolymers

Digital holographic data storage has been becoming more and more important in the study of optic data storage owing to its super high storage density, large capability and fast data rate. The key problem of the practical digital holographic data storage is to look for the more appropriate holographic recording medium. Photopolymer materials have many advantages: high sensitivity, high resolution, high diffraction efficiency, high signal-noise ratio, and completely dry real-time processing. All these characteris- tics make the photopolymer materials become the most potential candidate of digital holographic recording. In this work, at the basis of summarizing the progress of optic data storage technology, especially digital holographic data storage technology and its recording materials, we have mainly studied the contents as follows: 1. The photopolymer system is composed of acrylaminde and N, N' -methylene- bisacrylamidebisacrylamide as monomers, and xanthene dyes and thiazine dyes as sensitizers. As the result, the holographic characters of the photopolymer are greatly improved, especially in the widening of the sensitive spectra of the material. 2. The variations of diffraction efficiency as a function of exposure time, exposure energy, and exposure wavelengths are studied respectively. 3. The holographic characteristic parameters such as maxium diffraction efficiency, exposure sensitivity, modulate index, and dynamic range are calculated at different exposure wavelengths by using the experimental data of the exposure characteristic curves of the photopolymers. 4. The variations of transmission efficiency as a function of exposure time, exposure energy, and exposure wavelengths are studied respectively. The presence of noise gratings in holographic recording process induced by the scattering is demonstrated. 5. Four or more images are stored in the same location of the dry photopolymer film by multi-wavelength holographic storage technology, and the high fidelity holograms are reconstructed.