Magnetic recording on disks and tapes has been successfully used for digital data storage for over 25 years. Binary digits (bits) are stored as the presence or absence of magnetization reversals along a track. During readback, the sequence of magnetization transitions induces a corresponding pulse train, from which the recorded bit string is recovered by detection of peak positions relative to time intervals generated by a synchronized clock.
{"title":"Code Design for Optical Storage - a Comparison to Magnetic Storage","authors":"P. Siegel","doi":"10.1364/ods.1985.thaa1","DOIUrl":"https://doi.org/10.1364/ods.1985.thaa1","url":null,"abstract":"Magnetic recording on disks and tapes has been successfully used for digital data storage for over 25 years. Binary digits (bits) are stored as the presence or absence of magnetization reversals along a track. During readback, the sequence of magnetization transitions induces a corresponding pulse train, from which the recorded bit string is recovered by detection of peak positions relative to time intervals generated by a synchronized clock.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122684230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Conjugated polymers have been intensively studied in recent years due to their intrinsic conductivity and the wide range over which conductivity can be varied.1 Polypyrrole and polythiophene have received particular attention because these materials are stable in air with conductivity in the range of 102 S/cm.2 While conductivity and weight loss have been determined as a function of temperature,3 analysis of the resultant pyrolized products has not been attempted. Of particular interest is the photothermal and/or photochemical processes which would be initiated by a focused laser beam.
{"title":"Conductive Polymers as Active Optical Storage Media","authors":"W. Gambogi, L. Traynor, E. Buhks","doi":"10.1364/ods.1987.fa5","DOIUrl":"https://doi.org/10.1364/ods.1987.fa5","url":null,"abstract":"Conjugated polymers have been intensively studied in recent years due to their intrinsic conductivity and the wide range over which conductivity can be varied.1 Polypyrrole and polythiophene have received particular attention because these materials are stable in air with conductivity in the range of 102 S/cm.2 While conductivity and weight loss have been determined as a function of temperature,3 analysis of the resultant pyrolized products has not been attempted. Of particular interest is the photothermal and/or photochemical processes which would be initiated by a focused laser beam.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122487247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the near future, optical disk will find a big market in a field of office automation because of its large capacity and inter changeability, as a replacement for the widely used magnetic tapes and floppy disks.
{"title":"A New Tracking Servo Technology","authors":"S. Arai, K. Hamada, K. Ogawa","doi":"10.1364/ods.1985.thbb3","DOIUrl":"https://doi.org/10.1364/ods.1985.thbb3","url":null,"abstract":"In the near future, optical disk will find a big market in a field of office automation because of its large capacity and inter changeability, as a replacement for the widely used magnetic tapes and floppy disks.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132161055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
During the past few years, several write-once type optical disk file memory products have been introduced to the market and are establishing a stable rising curve of the optical memory era.
近年来，几款一次写入型光盘文件存储产品陆续上市，形成了光存储时代稳定的上升曲线。
{"title":"Present Status and Future Trends in Erasable Optical Memories","authors":"Y. Tsunoda","doi":"10.1364/ods.1985.tuaa1","DOIUrl":"https://doi.org/10.1364/ods.1985.tuaa1","url":null,"abstract":"During the past few years, several write-once type optical disk file memory products have been introduced to the market and are establishing a stable rising curve of the optical memory era.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127059623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The reproducibility of thermomagnetically written domains has been studied as a function of writing parameters and intrinsic magnetic parameters of magneto-optic films. Films with higher anisotropy constant, smaller aspect ratio, higher coercivity, and compensation temperature near or above room temperature result in a higher degree of domain reproducibility. It is shown that a wall stiffness model is consistent with the experimental results. Larger wall stiffness makes the domains less deformable from an equilibrium value and consequently results in domains which are more regular in size and shape.
{"title":"The effects of wall stiffness on reproducibility of thermo-magnetically written domains*","authors":"H. Shieh, M. Kryder","doi":"10.1364/ods.1985.waa4","DOIUrl":"https://doi.org/10.1364/ods.1985.waa4","url":null,"abstract":"The reproducibility of thermomagnetically written domains has been studied as a function of writing parameters and intrinsic magnetic parameters of magneto-optic films. Films with higher anisotropy constant, smaller aspect ratio, higher coercivity, and compensation temperature near or above room temperature result in a higher degree of domain reproducibility. It is shown that a wall stiffness model is consistent with the experimental results. Larger wall stiffness makes the domains less deformable from an equilibrium value and consequently results in domains which are more regular in size and shape.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127488164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Persistent spectral hole-burning (PHB, also called photochemical hole-burning) permits use of the optical frequency for encoding digital information through the presence and absence of spectral holes that are burned in inhomogeneously broadened absorption lines at low (liquid helium) temperatures. The optical frequency or wavelength at which a given hole is burned acts as an additional dimension for data storage, hence this optical recording scheme has been called Frequency Domain Optical Storage (FDOS). The combination of spectral and spatial data-recording can make storage densities in excess of 1010 bits/cm2 possible; furthermore, since rotation of the recording medium is not necessary, shorter random access times will result. The future success of the FDOS concept will rely on progress in several technological and engineering areas as well as on advances in several critical materials areas1.
{"title":"Frequency Domain Optical Storage: The Importance of Photon-Gated Materials","authors":"W. Moerner, R. Macfarlane, W. Lenth","doi":"10.1364/ods.1987.fa3","DOIUrl":"https://doi.org/10.1364/ods.1987.fa3","url":null,"abstract":"Persistent spectral hole-burning (PHB, also called photochemical hole-burning) permits use of the optical frequency for encoding digital information through the presence and absence of spectral holes that are burned in inhomogeneously broadened absorption lines at low (liquid helium) temperatures. The optical frequency or wavelength at which a given hole is burned acts as an additional dimension for data storage, hence this optical recording scheme has been called Frequency Domain Optical Storage (FDOS). The combination of spectral and spatial data-recording can make storage densities in excess of 1010 bits/cm2 possible; furthermore, since rotation of the recording medium is not necessary, shorter random access times will result. The future success of the FDOS concept will rely on progress in several technological and engineering areas as well as on advances in several critical materials areas1.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126742717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Write-once optical disks are emerging as an important medium for information storage. They provide high performance (in terms of carrier-to-noise ratio and bit error rates) and long life (~10 years). Extensive work has been published on write-once optical disk media based on organic dye-binder systems. Here we present some performance data for an erasable organic dye-binder optical disk medium.
{"title":"Performance of an Erasable Organic Dye-Binder Optical Disk Medium","authors":"M. Gupta, F. Strome","doi":"10.1364/ods.1985.wbb1","DOIUrl":"https://doi.org/10.1364/ods.1985.wbb1","url":null,"abstract":"Write-once optical disks are emerging as an important medium for information storage. They provide high performance (in terms of carrier-to-noise ratio and bit error rates) and long life (~10 years). Extensive work has been published on write-once optical disk media based on organic dye-binder systems. Here we present some performance data for an erasable organic dye-binder optical disk medium.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116895287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thin film stress plays an important role in the manufacture of optical data disks which have a rather low aspect ratio and are very susceptible to deformation. The stress parameter has been shown to be adjustable by varying deposition parameters. More recently, ion assisted reactive evaporation is a deposition technique which has been shown to be useful in controlling stress. The successful application of these techniques requires that that the stress be monitored in situ during the coating process, or by means of a stress monitor disk which is piggybacked in the coating run and measured afterward, or on a sample data disk from the coating run.
{"title":"Methods of Determining Thin Film Stress for Optical Data Storage","authors":"N. Thomas","doi":"10.1364/ods.1987.thd3","DOIUrl":"https://doi.org/10.1364/ods.1987.thd3","url":null,"abstract":"Thin film stress plays an important role in the manufacture of optical data disks which have a rather low aspect ratio and are very susceptible to deformation. The stress parameter has been shown to be adjustable by varying deposition parameters. More recently, ion assisted reactive evaporation is a deposition technique which has been shown to be useful in controlling stress. The successful application of these techniques requires that that the stress be monitored in situ during the coating process, or by means of a stress monitor disk which is piggybacked in the coating run and measured afterward, or on a sample data disk from the coating run.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121621163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An optical disk write/read head using integrated optics has been demonstrated by S. Ura et al.1 Figure 1 is a schematic drawing of a typical device.2 The light is emitted from a laser diode at one end of the slab (Point R1). The light is trapped in an optical film on the slab and travels in the form of a guided wave in one dimension. The light is diffracted by a grating which consists of modulation in the depth of the film or variation in the index. One order of the diffracted light comes to a focus at Point R2.
S. Ura等人已经演示了一种使用集成光学的光盘写/读磁头。图1是一个典型装置的示意图光从板的一端(点R1)的激光二极管发射。光被捕获在平板上的光学薄膜中，并以一维导波的形式传播。光被一个由薄膜深度调制或折射率变化组成的光栅衍射。一阶的衍射光聚焦在R2点。
{"title":"Design to minimize aberrations of focusing grating coupler under wavelength shift","authors":"P. Cronkite, G. Lawrence","doi":"10.1364/ods.1987.fc6","DOIUrl":"https://doi.org/10.1364/ods.1987.fc6","url":null,"abstract":"An optical disk write/read head using integrated optics has been demonstrated by S. Ura et al.1 Figure 1 is a schematic drawing of a typical device.2 The light is emitted from a laser diode at one end of the slab (Point R1). The light is trapped in an optical film on the slab and travels in the form of a guided wave in one dimension. The light is diffracted by a grating which consists of modulation in the depth of the film or variation in the index. One order of the diffracted light comes to a focus at Point R2.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115933454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A crucial factor in high density digital recording in magnetooptical disks is to reduce bit errors caused by bit shifting. Factors affecting bit shift include imperfections in the recorded pit and noise caused by residual signals after erasing, as well as intrinsic media noise and noise inherent in the detection process. Imperfections occur when write power varies or when reflectivity or magnetization fluctuates or varies randomly. Noise caused by residual signals after erasing occurs when the erase power or erase magnetic field is insufficient. This paper investigates the relationship between bit shift and write/erase laser power or erase magnetic field in an attempt to realize high density digital recording.
{"title":"Bit Shift Characteristics in High Density Magneto Optical Recording","authors":"M. Yamamoto, H. Nakanishi, A. Watabe, S. Hara","doi":"10.1364/ods.1987.wd3","DOIUrl":"https://doi.org/10.1364/ods.1987.wd3","url":null,"abstract":"A crucial factor in high density digital recording in magnetooptical disks is to reduce bit errors caused by bit shifting. Factors affecting bit shift include imperfections in the recorded pit and noise caused by residual signals after erasing, as well as intrinsic media noise and noise inherent in the detection process. Imperfections occur when write power varies or when reflectivity or magnetization fluctuates or varies randomly. Noise caused by residual signals after erasing occurs when the erase power or erase magnetic field is insufficient. This paper investigates the relationship between bit shift and write/erase laser power or erase magnetic field in an attempt to realize high density digital recording.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121877330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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