Hesselink L, Orlov SS, Liu A, Akella A, Lande D, Neurgaonkar RR
L. Hesselink, A. Liu, A. Akella, D. Lande, Stanford University, Stanford, CA 94305, USA. S. S. Orlov, Optitek, 1330 West Middlefield Road, Mountain View, CA 94043, USA. R. N. Neurgaonkar, Rockwell International Science Center, 1049 Camino dos.
Science. 1998 Nov 6;282(5391):1089-94. doi: 10.1126/science.282.5391.1089.
Optically gated recording and nonvolatile readout in a digital volume holographic data storage system that uses a pair of mutually incoherent light sources during recording and only one for readout were demonstrated recently. This approach used stoichiometric lithium niobate, which after post-growth processing gave rise to an at least two orders of magnitude improvement in sensitivity over the best materials reported previously. It is also shown that by adding certain dopants (iron and manganese) to near-stoichiometric lithium niobate, the dark storage time and gating efficiency can be increased compared with previous work. The underlying physical mechanisms of gated recording and the effectiveness of the gating process responsible for this manifold improved performance are discussed, and bipolarons and small polarons are identified as the responsible photorefractive species.
最近展示了一种数字体全息数据存储系统中的光控记录和非易失性读出，该系统在记录过程中使用一对相互非相干光源，而在读出时仅使用一个光源。这种方法使用了化学计量比的铌酸锂，经过生长后处理，其灵敏度比之前报道的最佳材料提高了至少两个数量级。研究还表明，通过向近化学计量比的铌酸锂中添加某些掺杂剂（铁和锰），与之前的工作相比，暗存储时间和门控效率可以提高。文中讨论了门控记录的潜在物理机制以及导致这种多方面性能提升的门控过程的有效性，并确定双极化子和小极化子是产生光折变效应的物质。
