用于蓝宝石长时光盘的光学信息读取系统

蓝宝石材料具有高度力学和化学稳定性,因此以蓝宝石作为衬底的光盘是实现长时数据存储的有效解决方案。但是,由于单晶蓝宝石材料具有明显的各向异性,当扫描光束入射到单晶蓝宝石基底表面时会发生双折射,从而使标准的CD读取系统对蓝宝石光盘失效。针对蓝宝石材料这一特性,建立了光束在单晶蓝宝石衬底中传输的物理模型,提出采用石英补偿板来补偿蓝宝石衬底像差的补偿机制。进行了数据读取实验,结果表明,采用所述像差补偿方法能够显著提高蓝宝石光盘光学信息读取系统的读取性能。

Read-out system for long-term optical sapphire discs

An optical disc using sapphire substrate is considered as an effective solution for achieving long term data storage due to its high mechanical and chemical stability. The birefringence in single sapphire crystal causes optical aberration which makes a failure during process of reading information from the disc. The propagation of the focused laser beam throughout a sapphire disc has been analyzed. The method of compensating aberrations when reading data from uniaxial birefringent medium was developed using quartz compensating plate. Finally, the data reading experiment was conducted. The result showed that the proposed aberration compensation method significantly improves the performance of information reading system from sapphire disc.