折射率失配对双光子三维光存储中像差的影响

Influence of Refractive Index Mismatch on the Optical Aberration in Two-Photon Three-Dimensional Optical Data Storage

双光子吸收三维光信息存储是实现高密度光存储的重要方法。三维数据写入过程中光束需经过两层不同的介质(如空气和存储材料),对像差和存储效果产生很大的影响,因此在理论和实验上分析系统各项光学参量对折射率失配引起的像差和存储效果的影响具有很大的意义。首先建立光学存储系统模型,在平行平板条件下,利用波像差函数推导展开,获得五项初级(赛德耳)像差,即球差、彗差、像散、场曲、畸变,然后对于存储材料在水平和倾斜两种情况下对初级像差进行模拟计算与分析,理论模拟与实验表明:物镜的数值孔径越大,像差随着存储深度增加而增大的速度就越快。

Two-photon three-dimensional optical data storage is an effective method for high-capacity data storage. The beam of light passes through two different media （such as air and storage material）in writing three-dimensional information and influences the optical aberration and storage effect. So it is important for analysing the effect of each optical parameter of system on the optical aberration and storage impression of refractive index mismatch in the theory and experiment. First, the model of the optical storage system is set up, in the condition of the parallel flat and via wave aberration function deducing, the five primary Seidel aberrations： spherical aberration, coma, astigmatism, field curvature, and distortion, are gotten, and simulations and analyses on the primary aberration in the two case of horizontal and tilted storage material are performed. Simulation and experiment proved that the slope of optical aberration increased with the increase of storage depth; if numerical aperture got bigger optical aberration augmented quicklier.