三维光存储中光束轴向整形研究

Research on Axial Beam Shaping in Three-dimensional Optical Storage

双光子三维光存储是实现高密度光存储的重要方法。在进行双光子三维光存储实验过程中,经过一段时间曝光后,存储点的尺寸在纵向和横向上不同,其根本原因在于圆高斯光束在空间两方向分布上不同。为了改善存储点的空间分布,通过模拟仿真从理论上证实了采用椭圆高斯光束改善存储点纵向分布的可行性。并且还讨论了光斑整形方法,对一种腔外加光学元件的方法进行了模拟仿真,可实现从圆高斯光束到椭圆高斯光束的整形。

Two - photon three - dimensional optical data storage is an effective method for high capacity data storage. In the two - photon three - dimensional optical storage, the size of storage dots in the vertical and horizontal are different after a period of exposure time; the fundamental reason is that the distribution of the two directions of circular Gaussian beam is different. To improve the spatial distribution of storage sites, simulation theoretically improves the feasibility of vertical distribution of storage sites with the use of elliptical Gaussian beam. Beam shaping methods are discussed in detail, and method of an external cavity optics is simulated to achieve beam shaping from a circular Gaussian beam to elliptical Gaussian beam.