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检索条件"任意字段=Advances in Optical Data Storage Technology"

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Challenges and opportunities for optical storage

Challenges and opportunities for optical storage

引用

Seventh International Symposium on optical storage, ISOS 2005

作者： Chen, Di Chen and Associates 2127 Centerview Lane Mound MN 55364 United States

optical technique for data storage was driven from the challenges to achieve data storage performance required by the user. The first attempt to address the recording density improvement over HDD using magneto-optic technology started over thirty years ago. Subsequent efforts to develop 15″, 12′ and 5 1/4″ WORM disc drives met with limited success. advances in semiconductor lasers, lithography, and auto focusing and tracking techniques finally allow the development of the Compact Disc to answer the call for improvement in audio recording technology and data distribution in mid to late 1980. Recordable and erasable technology then followed with the introduction of CD-R, CD-RW and MO drives and media. By early 1990, advances in high density recording with the use of shorter wavelength lasers, larger n.a. lenses, improved lithographic and data compression techniques, allows the development of 4.7 GB DVD drives and discs to answer the challenge for recording 2-hour high quality movies on a CD size disc. Recordable and erasable DVD became available in 2000, and Dual Layer DVD was introduced last year. With the advent of HDTV and movie in recent years, storage of 25 GB data in a DVD disc is needed. Blue-ray and HD-DVD are the leading technologies to answer this challenge. Looking to the future, optical storage areal density of one to two orders of magnitude improvement will be required to compete with HDD which is now reaching 133 Gb/in2. In addition, high data transfer rate of IGb/s, data security, copy protection, ease of use, cost and standards issues sums up the monumental challenges facing the optical recording industry in the years to come. Some of the leading technologies, such as multi-layer, new encoding schemes, volume recording, near-field optics, micro-optics, domain expansion, UV laser, holographic storage, could provide the answers. Meeting these challenges, optical storage could become the dominant recording technology to satisfy the data storage needs for

关键词： optical data storage

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Investigation of the growth and holographic storage properties of Fe:LiTaO₃ crystal

Investigation of the growth and holographic storage properti...

引用

Conference on advances in optical data storage technology

作者： Liu, CX Zhang, T Zhao, SZ Harbin Inst Technol Dept Appl Chem Harbin 150001 Peoples R China

ISBN: (纸本)0819455989

The LiTaO3 crystal doped with 0.03 wt% Fe2O3 was grown in a diameter-controlled Czochraski equipment using SiMo bar heater furnace. The photo-damage resistance ability, exponential gain coefficient, diffraction efficiency and response time of Fe:LiTaO3 and Fe:LiNbO3 crystals were measured. The measured results showed that the photo-damage resistance ability of Fe:LiTaO3 crystal was as much as 5 times higher than that of Fe:LiNbO3, the response speed of Fe:LiTaO3 crystal was improved one order of magnitude than that of Fe:LiNbO3, and the exponential gain coefficient and diffraction efficient of Fe:LiTaO3 crystal were smaller than that of Fe:LiNbO3, respectively. Using Fe:LiTaO3 crystal as recording medium, the obtained image was clear and complete in the holographic associative memory experiment using self-pump phase conjugate reflector.

关键词： Fe : LiTaO3 holographic storage exponential gain coefficient

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iCDMS: An iSCSI-based CD mirroring server

iCDMS: An iSCSI-based CD mirroring server

引用

Conference on advances in optical data storage technology

作者： Han, DZ Xie, CS Liu, C JiNan Univ Dept Comp Sci Guangzhou 510632 Peoples R China Huazhong Univ Sci & Technol Natl Storage Syst Lab Sch Comp Sci Wuhan 430074 Peoples R China

ISBN: (纸本)0819455989

A iSCSI-based CD mirroring server (iCDMS) has been developed and tested. Firstly, the iCDMS can automate to concurrently mirror multi- CD with multi- CD drivers, and the CD includes VCD, DVD, and so on. Secondly, the iCDMS can provide both of the file I/O and the block I/O services by an iSCSI module, which converges the NAS and SAN advantages, as high performance and data sharing across platforms. Thirdly, the iCDMS greatly improves the I/O speed by Zero Copy mechanism. Fourthly, the iCDMS implements automatically - allocating I/O bandwidth for different users and applications by enriching the metadata operating semantic of the CD server, and allocate a wider bandwidth for applications that has higher priority, changing the old average allocating bandwidth pattern;Finally, the iCDMS improves paralleled file I/O performance with a parallel FTP server module. In the experiments, the iCDMS has ultra-high-throughput for both of the file I/O requests and the block I/O requests..

关键词： CD mirroring parallel FTP iSCSI bandwidth allocation

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Blue-ray-induced optical properties of noble metal oxide thin film in super-RENS disk

Blue-ray-induced optical properties of noble metal oxide thi...

引用

Conference on advances in optical data storage technology

作者： Liu, Q Fukaya, T Tominaga, J AIST CAN FOR Tsukuba Ibaraki 3058562 Japan

ISBN: (纸本)0819455989

The optical reflectance and transmittance of Platinum oxide (PtOx) and palladium oxide (PdOx) mask layer, which are used to super-re solution near-field structure (super-RENS) disk, are investigated using Z-scan technique, under blue laser (442 nm) irradiation. The power thresholds of the PtOx and PdOx decomposition are obtained;the reversible and irreversible features for the two kinds of mask layers are cleared. Deformation in the micro irradiation region on surface of the mask samples, which is formed by decomposition of the PtOx or PdOx driving the Z-scan, is analyzed by means of an atom force microscope (AFM). The deformation analyses agree well with the Z-scan results. The optical features obtained at 442nm wavelength are compared with those at 532-nm wavelength, and the power threshold difference between the two wavelengths is also analyzed in detail based on irradiation power density and absorption spectrum of the mask samples.

关键词： Transmittance Statistical analysis Reflectivity Absorption Oxides Near field optics Atomic force microscopy Metals Laser irradiation optical properties

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Analysis on control methods of two-stage positioning for high-density optical disk mastering

Analysis on control methods of two-stage positioning for hig...

引用

Conference on advances in optical data storage technology

作者： Shen, QH Jiang, PJ Qi, GS Xu, DY Song, J Tsing Hua Univ Opt Memory Natl Engn Res Ctr Dept Precis Instrument & Mech Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

Two stage positioning method which is composed of coarse positioning and fine positioning is a way to increase the precision of linear feeding in high density disk mastering. The control method of two stage positioning is proposed in this paper. Different control models are compared and the suitable one is chosen. The PID controllers for coarse and fine tables are designed. The numerical simulating results show that the two stage positioning system with PID controllers has good performance in linear feeding with steady error less than 10nm. The coarse positioning table compensates the major component of displacement in linear feeding while the fine positioning table compensates the minor one. The two stage positioning system can well satisfied the requirement of high density disk mastering in theoretical.

关键词： optical disc mastering two-stage positioning linear feeding PID controller numerical simulating

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Synthesis of novel photochromic dithienylethenes and investigation on their optoelectronic properties

Synthesis of novel photochromic dithienylethenes and investi...

引用

Conference on advances in optical data storage technology

作者： Pu, SZ Xu, JK Shen, L Xiao, Q Liu, G Xiao, WH Zhang, FS Jiangxi Sci & Technol Normal Univ Jiangxi Key Lab Organ Chem Nanchang 330013 Peoples R China

ISBN: (纸本)0819455989

Four novel photochromic dithienylethenes compounds, 1,2-bis[2-methyl-5(p-fluorophenyl)-3-thienyl]perfluorocyclo-pentene (1a), 1, 2-bis[2-methyl-5(p-ethox yphenyl)-3-thienyl]perfluorocyclopentene (2a), 1,2-bis[2-methyl-5(p-N,N-dimethylaminophenyl)- 3 -thienyl]perfluorocyclopentene (3a) and 1,2-bis(2-methyl-5-naphthalene-3-thienyl)perfluorocyclopentene (4a) were synthesized. Their optoelectronic properties, such as photochromism in solution as well as in PMMA amorphous, fluorescence and electrochemistry properties were systematically investigated. These dithienylethenes have shown good photochromic behavior both in solution and in PMMA amorphous film. All of them exhibited relatively strong fluorescence. With the increase of their concentration in a THF solution, their fluorescence spectra showed a bathochromic shift. The irreversible anodic oxidation of la, 3a and 4a occurred when performing cyclic voltammetry tests. Moreover, dithienylethene la showed remarkable multi-color electrochromic properties during the anodic polarization. In addition, photo-mode multi-step optical storage using 2a and 3a as recording medium was performed successfully.

关键词： dithienylethene photochromism fluorescence electrochemistry multi-step optical storage

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A general purpose development kit for optical storage system design

A general purpose development kit for optical storage system...

引用

Conference on advances in optical data storage technology

作者： Chen, CH Yen, JY Huang, CY Lo, FH Natl Taiwan Univ Dept Engn Mech Taipei 10617 Taiwan

ISBN: (纸本)0819455989

optical Disk Drives (ODD) uses chipsets to implement the various functions required in its operation. The chipsets always have fixed algorithm that make it impossible for the researches to carry out any experiments on newly developed algorithms. To overcome this difficulty, this study has constructed a test platform for the ODD experiments. This platform solution allows for software implementation of all the necessary functions in the CD/DVD system. The researchers can easily alter the software to change the existing functions of to implement new functions for different applications. The hardware of this development system is mainly composed of MSC-51, FPGA, DSK, AD/DA module, and an analog mother board. The MSC-51 is responsible for applying commands and setting functions, and it plays a role of master in the system. The TI DSK 6711, served as a slave, is responsible for implementing new algorithms and focus is mostly focused on servo control. The FPGA is responsible for handshaking among the DSK, the MSC-51, and the AD/DA module board;it also provides the register banks for the MSC-51 and the DSK. The purpose of the AD/DA module board is to establish communication link to the physical world. There are two A/D chips of eight channels and four D/A chips of four channels on the AD/DA module board. There are also a pre-amp chip and a driver on the analog mother board to amplify the signal on the ODD and to drive a DC motor. Users only have to change the pre-amp and ODD for different type of ODD.

关键词： optical disk drive non PC-based

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Multiplexing holograms in the photopolymer with equal diffraction efficiency

Multiplexing holograms in the photopolymer with equal diffra...

引用

Conference on advances in optical data storage technology

作者： Yan, AQ Tao, SQ Wang, DY Shi, MQ Wu, FP Beijing Univ Technol Coll Appl Sci Beijing 100022 Peoples R China

ISBN: (纸本)0819455989

Photopolymer is an optimum material for practical holographic storage because of low cost and good characteristics. A new epoxy resin-photopolymer is reported. Polymeric binder is epoxy resin whose refractive index is high, but the monomer's refractive index is relatively low. The design can make monomer transfer freely in rigid frame, so we can realize no-shrinking recording and stabilize the recorded hologram. Simple grating is recorded in films, then we obtained the relationship curve between the exposure energy and diffraction efficiency by sending a single beam into the photopolymer film. According to the exposure curve, there is a recording delay, so the pre-exposure is needed to sensitize the material. In order to avoid cross-talk between contiguous holograms, angle selectivity of the material is measured. Then we investigate how diffraction efficiency is distributed in all multiplexed holograms with equal-time exposure. One method of calculating exposure schedule for multiplexing holograms in photopolymer with equal efficiency is presented. By using such exposure schedule, holograms are recorded at a single location by angle multiplexing, and the uniformity of their diffraction efficiency is remarkably improved. After iterating the procedure, it is possible to achieve much more uniform diffraction efficiency.

关键词： photopolymer volume holography holographic storage exposure schedule diffraction efficiency

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Ferrofluids for optical pick-up actuators as a heat transfer material

Ferrofluids for optical pick-up actuators as a heat transfer...

引用

Conference on advances in optical data storage technology

作者： Tsuda, S Hirota, Y Uzawa, E Kaneko, R Ferrotec Corp Chiba 2892131 Japan

ISBN: (纸本)0819455989

Rotational speed of optical drives and servo speed of optical pick-up actuators should be higher to meet high performance for optical drives. One of the methods to achieve such a high performance product is to increase an input power for the coil, but a heat problem generated by the coil will become serious. Two kinds of new ferrofluids have been designed to transfer a heat from the coil of optical pick-up actuator. Their physical properties have been properly designed to be functioned at a wide operating temp. and various aspects of their reliability including resistance for deterioration to high temp. and humidity, etc., have been evaluated. Also, they have been applied to optical pick-up actuators and the properties of ferrofluids such as heat transfer and shock resistance have been examined. The life tests showed that the new ferrofluids had at least two times longer life and a smaller viscosity change than CF-3A, which has been used in commercially available optical pick-up actuators. The new ferrofluids could tolerate the shock of 500 G without a ferrofluid splash, the coil temp. with the ferrofluid was about 10 degrees C or more lower than the one without it at the same input power.

关键词： ferrofluid heat transfer damping optical pick-up actuator servo speed

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Study on growth and storage properties of Zn:In:Fe:LiNbO₃ crystals

Study on growth and storage properties of Zn:In:Fe:LiNbO<sub...

引用

Conference on advances in optical data storage technology

作者： Wang, R Xu, YH Liu, XR Harbin Inst Technol Dept Appl Chem Harbin 150001 Peoples R China

ISBN: (纸本)0819455989

Zn ions were added into melts with 4.0mol.%, Fe ions were with 0.02mol.%, and In ions were with varying concentration of 0, 1.0, 2.0 and 3.0mol.%. A series of Zn:In:Fe:LiNbO3 Crystals were grown by Czochralski technique. Their absorption spectra and photo-damage resistant ability were measured. The mechanism of the shift of OH- absorption peak was investigated. Their photorefractive properties were experimentally investigated by using two-beam coupling. The results shown that, the photo-damage resistant ability of Zn(4mol.%):In(3mol.%): Fe(0.02mol.%):LiNbO3 Crystals were two orders than that of magnitude higher than that of Fe:LiNbO3 crystals, and with concentration of Zn and In ions increasing, diffraction efficiency and response time of crystals were shortened. The experiment of associative memory were also carried out with Zn(4mol.%):In(3mol.%):Fe(0.02mol.%):LiNbO3 crystals for the recording device and with Zn(4mol.%):In(2mol.%):Fe(0.02mol.%):LiNbO3 Crystals for phase conjugation.

关键词： Zn : In : Fe : LiNbO3 crystals photo-refractive properties photo-damage resistant ability associative memory

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