等曝光量时间递增双光子三维光存储  

Two-Photon Three-Dimensional Optical Data Storage with Equal Exposure Energy and Time Increase

作　　者：唐火红[1,2] 邢卉[3,2] 黄文浩[2] 张复实[4] 

机构地区：[1]合肥工业大学机械与汽车工程学院,安徽合肥230009 [2]中国科学技术大学精密机械与精密仪器系,安徽合肥230026 [3]中科院光电技术研究所微细加工光学技术国家重点实验室,四川成都610209 [4]清华大学化学系,北京100084

出　　处：《光学学报》2009年第5期1347-1351,共5页Acta Optica Sinica

基　　金：国家自然科学基金(50335050)资助项目

摘　　要：为提高双光子三维光存储的深层存储信息的读出信号强度和存储容量,根据Torok的光在多层介质中传播理论,模拟了折射率失配情况下(介质折射率为1.48,数值孔径为NA=0.65)双光子写入光束在不同存储深度处会聚点的强度分布,分析得到了会聚点处最大光强平方与存储深度的关系;根据原子的光吸收基本理论,分析得到了等曝光量写入光强不变情况下曝光时间随存储深度增加的递增关系;根据上述结果和利用自制的双光子三维光存储系统在光致变色存储材料中实现了连续八层的信息存储对比实验.实验结果表明等曝光最时间递增存储方法可有效提高存储容量和深层存储信息的读出信号强度。Intensity of laser focus was simulated in the condition of refractive index mismatch （n=1.48, NA=0.65） at different recording depth with two-photon writing based on Torok’s theory,in order to increase the readout signal intensity of deep layer bits and the memory capacity of two-photon 3D optical data storage. The relationship between the square of the maximum intensity at laser focus and the recording depth was acquired. Based on atomic absorption theory, the relationship between the exposure time and the recording depth in the condition of equal exposure energy without recording power changed was acquired. According to the results and using home-made two-photon 3D optical data memory system, the contrast experiment of recorded bits in eight consecutive layers with equal exposure energy and excitation time increasing was done in a photochromic storage medium. The experimental result indicates that the memory capacity is increased and the readout signal intensity in deep layer is enhanced effectively.

关 键 词：信息光学 三维光存储 双光子 存储深度 等曝光量 

分 类 号：TQ591[化学工程—精细化工]