中文摘要：

设计了一种单激光器双光子三维光存储系统。区别于目前普遍采用的双激光器方案,单激光器双光子三维光存储系统结构紧凑、体积小、光程短、所需元器件少。通过衍射光学元件的使用,实现了单一激光器,单一物镜和单一主光路的目标。该系统的聚焦伺服线性区为4λ,与现有的DVD伺服系统兼容。系统选层距离与衍射光学元件的位移距离呈近似的线性关系,选层伺服易于控制。当选层厚度为0.3mm时,衍射光学元件的最大位移距离为5.254mm,系统所需空间小。衍射光学元件表面微结构的最小环带间距为18.202μm,高度为1.6μm。

英文摘要：

Introduced is a compact optical system for two-photon three-dimensional optical data storage with a single femtosecond laser. Compared to traditional designs, by using a diffractive optical element （DOE） in the system, one single laser and one objective lens in a single optical path for servo beam is achieved. The optical system owns a linear region of 4）, which is compatible with current DVD servo module. The DOE is designed to control the layer-selection process conveniently, as there is a linear correlation between the displacement of DOE and that of the layer-selection. When the iayer-selection thickness is 0.3 mm, the maximum displacement of DOE is 5. 254 mm. The minimum grating period and the depth of DOE is 18. 202 μm and 1.6 μm, respectively.