三维光存储中折射率失配引起的球差补偿

Compensation of Spherical Aberration Induced by Refractive Index Mismatch in Three-dimensional Optical Storage

为实现三维光存储中折射率失配引起的球差补偿,建立了光学存储系统模型,获得了折射率失配引起的波前偏差函数与存储深度的表达式.采用泽尔尼克循环多项式对波前偏差函数进行补偿展开.在双光子荧光和单光子共焦荧光读出方式下,均可获得读出荧光强度与存储深度的关系:在折射率失配引起的球差未得到补偿矫正的情况下,存储深度在200μm左右读出荧光强度基本上下降为零;当折射率失配引起的初级球差被补偿矫正后,读出荧光强度随存储深度的下降得到较好改善;当折射率失配引起的二级球差被补偿矫正后,存储深度在1mm内存储点强度随深度基本上没有明显地变化.并且对像差补偿方法进行了具体地分析.

For the compensation of the spherical aberration induced by refractive index mismatch in three-dimensional optical storage,the model of the optical storage is established,and the expression of the wavefront phase aberration function is achieved induced by refractive index with the storage depth.The phase aberration function is spred with Zernike polynomials.Under reading method of two-photon fluorescence and one-photon confocal fluorescence,the relation of the intensity with storage depth is obtained：under uncompensating the spherical aberration induced by refractive index mismatch,storage fluorescence intensity falls to zero in the storage depth of 200 μm;under compensating the first-order spherical aberration,the downtrend of storage fluorescence intensity with the storage depth is improved;under compensation the second-order spherical aberration,the storage fluorescence intensity varies little in the storage depth of 1 mm.And the method of the aberration compensation is analyzed in detail.