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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。
Sapphire materials are highly mechanical and chemical stable, so sapphire as a substrate for optical discs is an effective solution for long-term data storage. However, due to the significant anisotropy of the single-crystal sapphire material, birefringence occurs when the scanning beam impinges on the single-crystal sapphire substrate surface, thereby deactivating the sapphire disk by a standard CD reading system. Aiming at the characteristics of sapphire material, a physical model of light beam transmission in single crystal sapphire substrate is established. The compensating mechanism of sapphire substrate aberration compensated by quartz compensator is proposed. Data reading experiments were carried out. The results show that using the aberration compensation method can significantly improve the reading performance of the optical information reading system of sapphire optical disk.