高密度光数据存储技术的发展

讨论了信息技术发展中信息数据存储的重要性,比较了磁存储和光存储的各自特点,介绍了光盘存储技术的发展趋势和高度光盘存储技术的关键问题,进一步讨论了超高密度光存储的发展可能。     

Thermal and Optical Properties of Cyanine Dye for High Density Digital Versatile Disc-Recordable (DVD-R)

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DVD光学头中的梯形光栅设计和表面粗糙度分析

为了符合实际加工情形 ,推导了梯形位相光栅衍射效率 ,设计其用作 DVD光学头分光束器件时的各参数 ,并分析推导了表面粗糙度对衍射效率的影响     

用于DVD光学头的刻环型双焦点物镜的设计

首先介绍了DVD读出系统对像差的要求 ,然后针对DVD光学头兼容CD盘片的要求介绍了刻环型双焦点物镜的基本结构和工作原理。详细介绍了适当的球面近轴参数的选取 ,包括使制造偏心灵敏度最小的物镜中心厚度的选取 ,物镜所需校正的像差种类以及如何选择优化变量等内容。最后给出了利用计算机设计的双焦点非球面物镜的设计结果 ,并讨论了刻环宽度选取的方法     

A DVD pickup based on dual-wavelength integrated laser diode

An innovative DVD pickup based on integrated dual-wavelength laser diode is developed. The dual-wavelength laser diode emits two lasers with different wavelengths. The laser with 650 nm wavelength is used for DVD, and the other with 780 nm wavelength is used for CD and CD-R/RW. Key techniques of this DVD pickup design are discussed. The feasibility of this scheme is proved by experimental results.     

Traceability of CDs/DVDs used as retrospective 222Rn detectors to reference STAR laboratory

The practical applications of the method for retrospective ²²²Rn measurements by home stored CDs/DVDs need a proper metrological assurance. The specific feature of this method, as compared to other methods for retrospective ²²²Rn measurements is the possibility for an individual a posteriori calibration of the used CD/DVD-detectors. This paper describes a procedure to ensure the traceability of this method to a reference STAR laboratory. A set of 7 groups of CDs/DVDs were exposed to 4 reference ²²²Rn exposure levels. After that they were treated in the etching laboratory as ”real” detectors and the ²²²Rn concentrations were determined by applying an individual a posteriori calibration, correction for high track density and correction for depth at which the alpha tracks were etched. The results from all 7 groups of exposed detectors demonstrated relative variation from the reference values in the interval 3.4–23.4%. The results provide evidence that the routine measurements by the CD/DVD method warrant measurements with a relative uncertainty better than 25% and therefore this method is acceptable for large-scale applications.     

GaN基蓝光半导体激光器的发展

文章介绍了下一代光存储用半导体激光器——GaN蓝光激光器的发展状况．对衬底材料的发展现状、外延片的生长技术以及激光器的制作工艺都作了论述．阐明了GaN激光器的一些技术路线，如GaN同质生长衬底的发展，侧向外延生长技术的采用以及湿法腐蚀腔面等．另外还介绍了GaN半导体激光器数字多功能光盘(DVD)的实用化进程．     

基于DVD读取头的光学探头电路设计

随着工业精密测量对于精度和分辨率的要求越来越高,光学探头在工业精密测量中得到了广泛的应用。由于DVD读取头的聚焦误差信号FES(Focus Error Signal)即S曲线的一部分与失焦距离成线性关系,因此稍作改进就可以做光学探头,用来进行微小位移的测量[1]。文中给出了其电路设计,该电路分成两个部分,一个是LD功率自动控制电路,一个是FES获取电路。经过实验测试,利用该电路可以获得良好的S曲线,可实现对微器件(几何尺寸数毫米至数微米,精度参数多为微纳米数量级)的精确测量。该电路设计具有结构简单、抗干扰能力强等突出优点。     

亚酞菁薄膜的光谱和光存储性质研究

利用真空蒸镀法制备了一种新的三硝基溴硼亚酞菁（BTN－SubPc)薄膜。在室温下测试了该亚酞菁染料在溶液和薄膜态的吸收光谱、薄膜态的反射和透过光谱，发现该薄膜在500nm-650nm波长范围内具有优良的吸收和反射特性。在632.8nm光盘静态测试仪上测试了覆盖有金属反射层的BTN－SubPc薄膜的静态光存储性能，结果表明，用较小功率和较窄脉宽的激光辐照膜片时，可获得大于30％的反射率对比度，显示出该材料用作短波长光存储介质（特别是用于可录型数字多用光盘）的巨大潜力。