Siyi Zhang, H. W. Zhang, X. Y. Guo, F. Zhang, C. Xu, B. Guo, Dimin Luo, Z. Y. Zhong
A new method to improve the structure and the magnetic-optical (MO) properties of sputtered bismuth garnet films for MO storage has been studied. The method employs high temperature ramp-up rate recurrent annealing as well as quenching in air environment. It results in small grain size (43.0 nm to approximately 30.0 nm), smooth surface, and less bubbles in the garnet film than those with conventional annealing. We discovered that the sample with more recurrent annealing only appeared in garnet phase, and its counterpart with fewer recurrent annealing appeared in garnet phase as well as DyFeO3 phase. Meanwhile the Farady angle and the coercivity increase with the recurrent number due to the increase of volume transitional rate of crystal phase in the film. Using this new method, garnet film has been successfully crystallized with a grain size of about 30.0 nm with excellent magnetic and MO properties.
{"title":"New method to improve the structure and magneto-optical properties of bismuth garnet films","authors":"Siyi Zhang, H. W. Zhang, X. Y. Guo, F. Zhang, C. Xu, B. Guo, Dimin Luo, Z. Y. Zhong","doi":"10.1117/12.150645","DOIUrl":"https://doi.org/10.1117/12.150645","url":null,"abstract":"A new method to improve the structure and the magnetic-optical (MO) properties of sputtered bismuth garnet films for MO storage has been studied. The method employs high temperature ramp-up rate recurrent annealing as well as quenching in air environment. It results in small grain size (43.0 nm to approximately 30.0 nm), smooth surface, and less bubbles in the garnet film than those with conventional annealing. We discovered that the sample with more recurrent annealing only appeared in garnet phase, and its counterpart with fewer recurrent annealing appeared in garnet phase as well as DyFeO3 phase. Meanwhile the Farady angle and the coercivity increase with the recurrent number due to the increase of volume transitional rate of crystal phase in the film. Using this new method, garnet film has been successfully crystallized with a grain size of about 30.0 nm with excellent magnetic and MO properties.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125878082","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}
By combining the practical mechanical transmission system with the laser cutting machine of optical disks, a high precision dynamic measurement system of round to long mechanical transmission link is designed. The working principle and system errors are described. Our experiments have proved that the measurement system is completely competent for the measuring task. The special computer interface board and the practical computer software are designed with advantages of fast data collecting and high processing ability. The mechanical transmission link error can be obtained after processing the data.
{"title":"Dynamic measuring system of mechanical transmission link in laser cutting machine of optical disks for servo grooves and preformatted information","authors":"Yifang Wang, Li-Ding Wang","doi":"10.1117/12.150658","DOIUrl":"https://doi.org/10.1117/12.150658","url":null,"abstract":"By combining the practical mechanical transmission system with the laser cutting machine of optical disks, a high precision dynamic measurement system of round to long mechanical transmission link is designed. The working principle and system errors are described. Our experiments have proved that the measurement system is completely competent for the measuring task. The special computer interface board and the practical computer software are designed with advantages of fast data collecting and high processing ability. The mechanical transmission link error can be obtained after processing the data.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114713857","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 test unit is described which includes an automatic focusing device and a displacement sensor for lens movement. The resolution of the unit is 20 nm in the range of +/- 40 micrometers . In addition, a technique for ensuring the focal spot using the character of the laser diode is presented. This measurement principle can be widely used in the areas of precision manufacture, optical industry, and soft materials testing.
{"title":"Dynamical focusing electro-optical sensor system for measuring surface contours","authors":"R. Gu, C. Xu, L. Lio, G. Shen","doi":"10.1117/12.150666","DOIUrl":"https://doi.org/10.1117/12.150666","url":null,"abstract":"A test unit is described which includes an automatic focusing device and a displacement sensor for lens movement. The resolution of the unit is 20 nm in the range of +/- 40 micrometers . In addition, a technique for ensuring the focal spot using the character of the laser diode is presented. This measurement principle can be widely used in the areas of precision manufacture, optical industry, and soft materials testing.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133111284","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 analytical calculation is applied for temperature distribution in a garnet disk with bilayer structure. An optimized structure is designed to lower the writing power and obtain good read- out performance and the influence of writing conditions on temperature distribution is discussed.
{"title":"Analytical study on thermomagnetic writing properties of BiGa:DyIG films with bilayer structure","authors":"T. Du, D. Shen","doi":"10.1117/12.150644","DOIUrl":"https://doi.org/10.1117/12.150644","url":null,"abstract":"An analytical calculation is applied for temperature distribution in a garnet disk with bilayer structure. An optimized structure is designed to lower the writing power and obtain good read- out performance and the influence of writing conditions on temperature distribution is discussed.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126954307","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}
Yujing Huo, Jinxing Cai, D. Shen, Gansheng Li, Pu Wang
We have developed three types of green solid state lasers pumped by laser diodes. A green laser outputs up to 24.5 mW at 532 nm with Nd:YAG/KTP crystal, the second outputs up to 19 mW with Nd:YVO4/KTP crystal and the third up to 29 mW with LNYAB crystal. The experiments setups and results are discussed. Comparison of these three kinds of lasers are presented.
{"title":"Laser-diode-pumped green laser for optical storage","authors":"Yujing Huo, Jinxing Cai, D. Shen, Gansheng Li, Pu Wang","doi":"10.1117/12.150670","DOIUrl":"https://doi.org/10.1117/12.150670","url":null,"abstract":"We have developed three types of green solid state lasers pumped by laser diodes. A green laser outputs up to 24.5 mW at 532 nm with Nd:YAG/KTP crystal, the second outputs up to 19 mW with Nd:YVO4/KTP crystal and the third up to 29 mW with LNYAB crystal. The experiments setups and results are discussed. Comparison of these three kinds of lasers are presented.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122534055","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 order to make the laser diode of an optical disk drive work reliably and stably, this paper proposes a driving and protecting circuit and a laser power feedback control system which can almost eliminate the influence of component parameter change and power voltage fluctuation.
{"title":"Design of driving and protecting circuit for stable laser diodes","authors":"Maotai Hu, Chunyi Wu, Xiong Qian","doi":"10.1117/12.150669","DOIUrl":"https://doi.org/10.1117/12.150669","url":null,"abstract":"In order to make the laser diode of an optical disk drive work reliably and stably, this paper proposes a driving and protecting circuit and a laser power feedback control system which can almost eliminate the influence of component parameter change and power voltage fluctuation.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124075140","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 this paper, holographic optical elements (HOEs) used in optical disk systems are discussed. HOEs have been used to form several beams for detecting focusing and tracking error, as a beam splitter and a formatter of wavefront. It can also be used as an objective lens in the future.
{"title":"Holographic elements used in optical heads","authors":"Duanyi Xu, Ying Wang, Longfa Pan","doi":"10.1117/12.150665","DOIUrl":"https://doi.org/10.1117/12.150665","url":null,"abstract":"In this paper, holographic optical elements (HOEs) used in optical disk systems are discussed. HOEs have been used to form several beams for detecting focusing and tracking error, as a beam splitter and a formatter of wavefront. It can also be used as an objective lens in the future.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133792277","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 this paper a scheme increasing raster images stored in a WORM is studied. A two- dimensional coding method improved from the CCITT (Comite Consultatif Interationale Telegraphie et Telephonie) is used to compress the image data. And a means of saving image to the WORM in batches is taken to increase the WORM space utilization ratio.
{"title":"Two-dimensional coding of raster image and saving images to WORM in batches","authors":"Hanyong Wang","doi":"10.1117/12.150671","DOIUrl":"https://doi.org/10.1117/12.150671","url":null,"abstract":"In this paper a scheme increasing raster images stored in a WORM is studied. A two- dimensional coding method improved from the CCITT (Comite Consultatif Interationale Telegraphie et Telephonie) is used to compress the image data. And a means of saving image to the WORM in batches is taken to increase the WORM space utilization ratio.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133770085","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}
Gui-ying Wang, Jun Ding, Liuhong Wang, Z. Shi, Xishan Li, F. Gan
According to the image relay concept in the optical amplification system, submicrometer resolution of a digital image processing system has been given in this paper. The accuracy and precision of the system has been examined by using a standard identification reticle, and some measurement results of a small focal spot through a computer generated holographic lens have been given.
{"title":"New approach to measuring small beam diameters","authors":"Gui-ying Wang, Jun Ding, Liuhong Wang, Z. Shi, Xishan Li, F. Gan","doi":"10.1117/12.150659","DOIUrl":"https://doi.org/10.1117/12.150659","url":null,"abstract":"According to the image relay concept in the optical amplification system, submicrometer resolution of a digital image processing system has been given in this paper. The accuracy and precision of the system has been examined by using a standard identification reticle, and some measurement results of a small focal spot through a computer generated holographic lens have been given.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114404430","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}
Xiangyou Yu, H. Watabe, S. Iwata, S. Tsunashima, S. Uchiyama
Magnetic and magneto-optic (MO) properties are investigated for (Nd,Pr)Gd/FeCo multilayer films (MLFs) prepared by means of rf magnetron sputtering. Perpendicularly magnetized films with a good square Kerr hysteresis loop, which is necessary for high density magnetic recording media, are prepared by adjusting the composition as well as the thickness of each layer and bilayer period. Within the frame of this work, the best result is obtained for conditions of approximately 33% Nd, approximately 10% Co, bilayer period of 1 nm, and bilayer thickness ratio of 1. The figure of merit for the Kerr read out in MO memory is found to be 0.36 deg at 400 nm, which is about 30% larger than that for Tb-FeCo.
{"title":"Magnetic and magneto-optic properties of (Nd, Pr)Gd/FeCo multilayers","authors":"Xiangyou Yu, H. Watabe, S. Iwata, S. Tsunashima, S. Uchiyama","doi":"10.1117/12.150641","DOIUrl":"https://doi.org/10.1117/12.150641","url":null,"abstract":"Magnetic and magneto-optic (MO) properties are investigated for (Nd,Pr)Gd/FeCo multilayer films (MLFs) prepared by means of rf magnetron sputtering. Perpendicularly magnetized films with a good square Kerr hysteresis loop, which is necessary for high density magnetic recording media, are prepared by adjusting the composition as well as the thickness of each layer and bilayer period. Within the frame of this work, the best result is obtained for conditions of approximately 33% Nd, approximately 10% Co, bilayer period of 1 nm, and bilayer thickness ratio of 1. The figure of merit for the Kerr read out in MO memory is found to be 0.36 deg at 400 nm, which is about 30% larger than that for Tb-FeCo.","PeriodicalId":212484,"journal":{"name":"Optical Storage and Information Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114533608","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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