日立万胜推出最高容量50G的4倍速蓝光光盘

日前,日立万胜推出两款蓝光光盘。这两款光盘分别是4倍速BD-R和单碟双层BD-RE光盘,这两种光盘将于11月上市。此次推出的BD-R光盘容量为25GB,支持4倍速刻录,非刻录面设计了供喷墨式打印机打印用的表层。并支持直接在光盘表面印刷图案。另一款     

夏普超分辨光盘可存储100GB数据

夏普公司发展出一种蓝光激光存储技术，其储存信息为现在进入市场的蓝光光盘每层数据的2倍。     

超越蓝光DVD的存储技术

以色列Mempile公司的TeraDisk技术可将光存储设备最高容量提高到1TB．远远超过蓝光碟片200GB的存储能力。[编者按]     

模块化蓝光光存储性能静态测试系统

蓝光光存储是信息存储领域发展的一个重要方向。测试系统是研究蓝光光存储材料的必备条件，为建立蓝光光存储研究平台，设计和搭建了一套模块化蓝光光存储性能静态测试系统。激光工作波长为406．7nm。系统采用调制解调技术降低系统噪声，提高测量粘度：采用光点移动模式降低对样品尺寸的要求；采用纳米平台提高记录点的反复定位性能。实验结果证明测试系统性能良好，可以满足蓝光光存储性能静态测试要求。     

光存储，还是硅存储

标准的格式之争也正式结束，蓝光DVD取得了阶段性的胜利。但是，对于高清视频存储市场，蓝光DVD的前途并不乐观。因为，近几年闪存技术的突飞猛进，使得硅存储正在慢慢取代光存储。     

蓝光LED的新进展和GaN蓝光激光二极管的诞生

本文综述了蓝光ＬＥＤ和激光二极管的新进展。氮化镓材料系作为未来短波半导体光源的优质日益明显，以ＧａＮ为基的超高亮度的蓝，绿光ＬＥＤ获得重大进展，以ＧａＮ为基的蓝光激光二极管也已诞生。本文着重了介绍了ＧａＮ蓝光器件衬底的种类和制备方法，对量子阱ＬＥＤ和新诞生的多量子阱ＩｎＧａＮ蓝光激光二极管的结构及特性也进行了重点介绍。     

以蓝光为存储和联通媒介的全台网络化建设方案

在电视台网络化建设过程中,采用蓝光技术作为存储和联通的媒介,既具有全程数据化带来的资源共享性,也具有自动化与手工传递相结合带来的流程灵活性,是中小型电视台网络化建设的新思路和新途径.     

有关磁光存储技术的一些术语

数据存储行业的发展促成了一批术语的问世,这是些只用一组字母来表示的术语。与其他技术行业相似,随着时间的推移,字母后面的意义常常会变得模糊起来。下文介绍了一些磁光(MO)存储器件中“字母后面”的含义。数值孔径 光学透镜的数值孔径(NA)越大则表示其成像越清晰越明亮,而对于MO驱动器的激光元件而言,越大的数值孔径表示入射光束的直径或盘面上的光点直径越小。典型磁光产品(符合ISO标准)的透镜NA值是0.55,随着激光器、透镜及光纤技术的不断发展,数值孔径大小有可能提高至1.0,这已是固体透镜的折射极限了。     

红蓝光联合治疗与单纯蓝光治疗面部寻常型痤疮的疗效对比

目的：比较红光（630nm）和蓝光（415nm）联合治疗与单纯蓝光（415nm）治疗面部寻常型痤疮的临床疗效。方法：将61例面部寻常型痤疮患者随机分为红蓝光联合治疗组与单纯蓝光治疗组,分别进行8周治疗,于实验第2周、4周、6周、8周对疗效进行比较分析。结果：59例患者完成了实验,红蓝光联合治疗组对脓疱、结节/囊肿的疗效（皮损总数的减少率）较单纯蓝光治疗组好,而单纯蓝光治疗组对丘疹的疗效较好,所得结果均有统计学意义（P〈0.05）。8周治疗结束后,两组皮损总有效率无差异性（P〉0.05）。结论：红蓝光联合治疗及单纯蓝光治疗均对面部寻常型痤疮有一定的疗效,虽然二者总体疗效无差别,但对不同类型皮疹的疗效不同,且所得结果有统计学意义。     

蓝光激光器满足过硬的商品化要求

波长短于红色（＜６３５ｎｍ）的发光二极管（ＬＥＤ）和激光二极管（ＬＤ）对于全息存储、光盘（ＣＤ）、打印机和其它器件具有重要的意义,因此许多开发致力于研制发射蓝光的ＬＤ。氮化镓和基于其它Ⅲ－Ⅴ族氮化物的半导体具有对发射蓝光器件合适的直接带隙。在室温下,...     

Write Strategy Learning for Optical Dye Recording

Write strategy tuning for optical recording devices (ORDs) is laborious and time consuming. An automated learning approach based on the genetic algorithm (GA) is proposed to automatically learn the write strategy implemented in an ORD for dye recording media. To evaluate the writing performance associated with every set of writing parameters in the write strategy, jitters corresponding to different lengths of pits and lands are utilized as the optimization index. A system is designed that integrates the jitter measurements with the GA based write strategy optimization. To optimize the writing parameters in write strategy, all the parameters are implemented as genes in GA's chromosome and the jitters are transmitted from the ORD to a PC through the integrated drive electronics bus. It will be shown that the proposed automated learning approach can successfully learn the write strategy for different dye recording optical discs at different recording speeds.     

相变光盘的多层膜结构

实用的相变光盘膜应由包含相变介质膜和匹配膜的多层膜结构绍成。本文根据膜系特征导纳矩阵,匹配设计了相变光盘的多层膜结构。设计结果表明:(1)λ=8300 处多层膜结构较单层膜结构(只有相变记录介质膜)对写入激光吸收提高一倍左右;(2)反射率对比度有较大提高,R_c∶R_a可达4∶1。最后对设计结果给出了实验证实。     

光盘存储光学头的写入特性

本文利用脉冲斑模型,分析在光盘存储过程中,光学系统的各种因素,如光功率起伏,光束高斯参数,物镜数值孔径,系统像差及伺服误差等,对所记录信息斑点的影响,结合读出信噪分析,给出了写入光学头的像差容限和伺服要求。     

Design of Close-to-Capacity Constrained Codes for Multi-Level Optical Recording

We report a new method for designing (M,d, k) constrained codes for use in multi-level optical recording channels. The method allow us to design practical codes, which have simple encoder tables and decoders having fixed window length. The codes presented here for the d = 1 and d = 2 cases, achieve higher storage densities than previously reported codes, and come within 0.3 - 0.7% of capacity.     

Analysis of Nonlinear Transition Shift and Write Precompensation in Perpendicular Recording Systems

In high density perpendicular magnetic recording channels, nonlinear transition shift (NLTS) is one of the distortions that can degrade the system performance. Write precompensation is a standard method used to combat the negative effect of NLTS. In this paper, we present an analysis of the bit-error-rate (BER) for perpendicular recording systems with NLTS and write precompensation. Media jitter noise and additive white Gaussian noise are also considered in the model. A BER lower bound is derived, as well as a more easily computed estimate of the bound. The write precompensation values that numerically minimize the estimate of the BER lower bound prove to be very close to those found using Monte-Carlo channel simulation. We then apply these methods to the design of multilevel precompensation schemes, for which the optimization of precompensation values by Monte-Carlo channel simulation is computationally infeasible. The results show that for higher recording densities subject to increased ISI and noise, the use of more complex precompensation schemes does not significantly improve the system performance.     

Dinuclear Metal–Organic Material for Binary Optical Recording

A diimine ligand tethered to anthracene in the 9‐position, 4′‐(9‐anthrylethyl)‐4‐methyl‐2,2′‐bipyridine (bpy‐An), was dimerized through cycloaddition photochemistry. The resultant head‐to‐tail photodimer (bpy‐PD) was used as a bridging ligand in the preparation of a new dinuclear Ru^II complex, [Ru(dmb)₂(bpy‐PD)Ru(dmb)₂]⁴⁺ (dmb = 4,4′dimethyl‐2,2′‐bipyridine). The corresponding mononuclear species containing anthracene ([Ru(dmb)₂(bpy‐An)]²⁺ was also synthesized and serves as a model compound in this study. UV photolysis (λ < 300 nm) of the strongly luminescent Ru^II dinuclear complex results in cycloreversion, generating two anthracene‐containing mononuclear species, [Ru(dmb)₂(bpy‐An)]²⁺, whose emission is largely quenched as a result of nonradiative triplet–triplet energy transfer. The photophysical and photochemical properties of the dinuclear system have been studied in CH₃CN solutions and in solid polyvinyl alcohol (PVA) thin films. The “on”–“off” luminescence switching characteristics and concomitant non‐destructive readout properties suggested that these molecules could be useful in read‐only memory (ROM) applications. In the solid state, micrometer‐sized objects were imaged using visible light, taking advantage of the luminescence contrast generated from the UV photochemical reaction. These written images were stable for at least 6 months, indicating that long‐term binary data storage is indeed feasible in these ROM metal–organic materials.     

光盘记录介质研究进展

随着材料科学、光存储技术的发展,国内外对光存储介质的研究不断深入.文章对全息、光谱烧孔、电子俘获、双光子、光致变色材料等光盘记录介质及其存储机理研究进展进行了综述.     

光记录通道的眼图分析

本文在一维光记录读出信号模型的基础上，分别对脉冲位置调制（ＰＰＭ）记录和脉冲宽度调制（ＰＷＭ）记录读出信号眼图的高度进行分析，从而发现适合两种记录方式的游长度受限码（ＲＬＬ）该方法可论证：（２，７）码适用于ＰＰＭ格式，而（１，７）码适合于ＰＷＭ格式。