Three dimensional confocal optical memory

研究了三维共焦光存储。数据由聚焦豆在光聚合物中记录为折射率点。用相差显微镜读出数据，实现了30层记录和读出。层距为10微米，数据间距为2微米，研制了用于数据读取系统的共焦相差显微镜。与传统的相差显微镜相比，共焦相差显微镜读出的数据图像的对比度有了很大的提高。研究了可擦除三维光学存储器。数据记录介质采用光折变晶体。数据用聚焦光束记录，用均匀照明擦除。我们发展了一种不需要任何近似就能求解库赫塔夫方程的计算方法。确定了聚焦光可以记录1比特数据，诱导折射率局域化在聚焦光束点，数据没有消失超过一周，并确定了读出系统晶轴与光轴的最佳方向。

Three dimensional confocal optical memory was studied. Data were recorded by focused bean in a photopolymer as refractive-index dot. The data were read out with phase contrast micrscope.We achieved 30 layrs recording and reading. The distance between layrs were 10 mum, and the distance between data were 2 mum.A confocal phase-contrast microscope was developed for data reading system. The contrast of data image read out with the confocal phase-contrast microscope is greatly improved compared to one with conventional phase-contrast microscope.Erasable three dimensional optical memory was studied. Photorefractive crystal was used for data-recording medium. Data were recorded by focused beam, and erased with uniform illumination.We developed a calculation method to solve Kukhtarv's equations without any approximation. We confirmed that one-bit datum could be recorded by focused beam, and the induced refractive-index localized at the point of focused beam, and the data did not disappear more than one week.We also determined the optimum direction of crystal axis to the optical axis of reading system.