同轴式光全息存储技术及其系统

同轴式光全息存储技术是新型超大容量超高速存取的光学存储技术。具有反射式结构的光盘可以将再现光反射回聚焦透镜,因而可以简化系统结构,而且可与现有的光盘系统(如CD和DVD)很好地兼容。引进现有光盘的伺服控制技术可以有效地保持聚焦透镜与光盘间距和精确定位,因而,可将全息图准确无误地记录在媒体中并准确无误地再生出来而不受外界的振动影响。首先讨论了传统的“双光束干涉法”在商品化方面遇到的难题,从而引出了同轴式光全息存储技术并演示了它的记录、再生的实验结果。通过实验数据分析计算了该光盘系统的角度偏差和光源波长容限范围。为实现装置的低成本和小型化等方面提供了理论依据。

Collinear Holographic Information Storage Technologies and System

Collinear holography is a technology for ultra-high density and ultra-high speed optical storage system.The reflective disc structure can reflect the reconstructed image back to the same objective lens.As this reason,the system structure can be simplitied which is compatible with existing storage disc systems,like CD and DVD.Servo technologies,which are applied in the optical disc,can precisely maintain the distance and the relative position of the objective lens and the disc,and the holograms can be recorded and reconstructed in a disc accurately.Furthermore a vibration isolator is not necessary any more.The existing essential issues for practicality in conventional 2-axis holography are discussed firstly.And then,collinear holography is introduced and the recording and reconstructing process is demonstrated.Tilt margin and wavelength margin of this system are analyzed from the experimental results.it is proved that the low cost and compactable device can be manufactured theoretically.