Photopolymer Sensitized By Acridine Orange And Study Of Its Digital Holographic Storage

Digital holographic data storage has been extensively studied with the aim of meeting the increasing demand for high-density data storage owing to its many attractive features, such as high data recording density, high data transfer rates and its parallel processing characters. On the base of the review of the process of high-density optical information storage technology, the holographic storage principle and characteristics of photopolymer, the study had been done about photopolymer recording materials and digital holographic data storage system in this dissertation. It includes:1. A novel photopolymer sample consists of polyvinylacohol as a binder, acrylamide and N,N'-methylenebisacrylamide as monomers, triethanolamine as a photoinitiator and acridine orange as a photosensitizer for holographic storage was fabricated; By optimizing the components of the sample, a reasonable optimal concentration was obtained.2. The holographic characteristic parameters of the photopolymers of diffraction efficiency, exposure sensitivity and dynamic range were studied in different wavelength, different exposure energy, different beam ratio and different thickness. The transmittance and Bragg-mismatch of the photopolymers were also studied by experiment method.3. Two dimensional analog images and digital data pages generated by spatial light modulator were stored in the photopolymer sample, and the reconstructed pages had good fidelity.4. Every parts of function in digital holographic storage system, the noise source in optical storage and the description of binary image quality was studied.5. A new encoding method was studied. This method can automatically determine the admission threshold, which is very beneficial for improving the accuracy of the reconstructed data. A binary image which was coded with a binary file was recorded in the photopolymer sample and the reconstructed hologram could be decoded into correct text.