光致变色多阶光盘的光学通道模型  

Analysis of the optical channel of a photochromic multi-level optical disc

作　　者：雷志军[1] 徐端颐[1] 赵辉[1] 齐国生[1] 刘嵘[1] 佘鹏 樊美公[2] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084 [2]中国科学院感光化学研究所,北京100101

出　　处：《清华大学学报（自然科学版）》2004年第5期645-648,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(G19990330)

摘　　要：光致变色多阶存储系统的光学通道分析是分析和设计后续信号处理部分的前提。该文以Fourier光学作为理论工具,研究光盘表面的反射场变化引起的光学头出瞳面上光场分布变化;利用Fourier光学和光致变色记录斑的可叠加性,得到了光致变色多阶光盘的光学通道模型,并根据此模型研究了单记录斑的读出信号及其各组成部分之间的关系。实验中采用俘精酸酐类光致变色材料作为记录层,使用不同的激光功率和写入时间的组合,由大、中、小3种幅值和零功率写入实现了4阶存储。结果表明,实验的读出信号与仿真计算的结果相吻合。Analysis of the optical channel of a photochromic multi-level storage system is the basis of the design of signal-processing sub-systems. Fourier optics was used to study the change of the the optical field distribution on the exit pupil of the pickup caused by the change of the reflective field on the optical disc surface. The superposition characteriscs of the Fourier optics and the photochromic marks was used to develop a model of the optical channel of a photochromic multi-level optical disc to analyze the readout signal and the relations between its components over a single mark. The experiments used a kind of fulgide photochromic material as the recording layer. Different combinations of the laser power and the write time were used with 4-level recording realized using high, medium, low and zero laser diode powers. The result shows that a numerical analysis is verified by the experimental readout signals.

关 键 词：光通道模型 光致变色 光盘 多阶存储 光学通道分析 Fourier光学 

分 类 号：TP333.4[自动化与计算机技术—计算机系统结构] O436[自动化与计算机技术—计算机科学与技术]