Three-Dimensional Magneto-Optical Recording

2004 ◽  
Vol 834 ◽  
Author(s):  
Akiyoshi Itoh
Keyword(s):  
Storage System ◽  
Three Dimensional ◽  
Optical Recording ◽  
High Density ◽  
The Novel ◽  
National Project ◽  
3 Dimensional ◽  
Disk Storage ◽  
High Density Recording ◽  
New Type

ABSTRACTIn this report, the newly developed three-dimensional magneto-optical (MO) recording scheme and the experimental results are reported. A part of this work has been done as the national project of 3D-MO (3-dimensional MO) project. It started at September 1998 and ended March 2002 as a part of the national project “Nanometer-Scale Optical High Density Disk Storage System” and aimed at achieving 100 Gb/in2 in storage density. Three-dimensional MO recording is one of the prosperous candidates of next generation ultra high density recording. Magnetic amplifying MO system (MAMMOS) is employed for achieving the novel three-dimensional MO recording. Double-MAMMOS scheme consists of 2-recording layers of differing compensation temperature (Tcomp ) and one readout layer was proposed and discussed.With write/read test it is succeeded to show the results corresponding to a 100 Gb/in2 (50 Gb/in2 × 2) recording density. We also proposed and showed results of simulations of a new type of Double-MAMMOS in which the recording layers can hold quadri-valued information by single writing process.

High-density recording storage system by Collinear holography

2006 ◽  
Author(s):  
Hideyoshi Horimai ◽  
Xiaodi Tan ◽  
Yoshio Aoki
Keyword(s):  
Storage System ◽  
High Density ◽  
High Density Recording

scholarly journals New Type Direction Curves in 3-Dimensional Compact Lie Group

Symmetry ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 387 ◽  
Author(s):  
Ali Çakmak
Keyword(s):  
Lie Group ◽  
Three Dimensional ◽  
Normal Direction ◽  
General Definition ◽  
Compact Lie Group ◽  
3 Dimensional ◽  
New Type ◽  
Definition Of

In this paper, new types of associated curves, which are defined as rectifying-direction, osculating-direction, and normal-direction, in a three-dimensional Lie group G are achieved by using the general definition of the associated curve, and some characterizations for these curves are obtained. Additionally, connections between the new types of associated curves and the curves, such as helices, general helices, Bertrand, and Mannheim, are given.

Research on the Application of DVD Pick-Up Head in Three-Dimensional Optical Storage

2011 ◽  
Vol 291-294 ◽  
pp. 1377-1380
Author(s):  
Jian Wen Cai ◽  
Fei Meng ◽  
Ya Feng Zhang ◽  
Mei Feng Zhang ◽  
Xue Tao Pan
Keyword(s):  
Data Storage ◽  
Storage System ◽  
Three Dimensional ◽  
Optical Storage ◽  
Optical Disk ◽  
Photon Absorption ◽  
Optical Data ◽  
Error Signal ◽  
Disk Storage ◽  
Two Photon

Two-photon three-dimensional optical data storage is an effective method for high capacity data storage. Based on DVD pick-up head and two-photon absorption, two-photon three-dimensional optical disk storage system is built, and operating principle of the overall system is in detail. In the servo module of three-dimensional optical disk storage system, DVD circuit control board (MT1389SE) is conducted on three-point improvement: extract focus servo error signal and servo error signal, increase four communications interfaces，increase photoelectric detectors; the extraction of focus and track servo signal on reading and writing module is analyzed in detailed. The measured principles and methods of the voice coil motor characteristic curve of Sanyo DVD pick-up head (SF-HD60S) are analyzed in detailed by using dual-frequency laser interferometer, which can be well meet the layer selection requirements of three-dimensional optical storage. DVD pick-up head applied in three-dimensional optical storage overcomes the limitations of three-dimensional scanning stage, integrates with existing DVD servo technology, and lays a solid foundation for practical use of two-photon three-dimensional optical storage.

Long-lasting phosphorescence and photostimulated long-lasting phosphorescence in Mn2+-doped alumino-phosphofluoride glasses irradiated by a femtosecond laser

2003 ◽  
Vol 18 (3) ◽  
pp. 616-619 ◽  
Author(s):  
Xiongwei Jiang ◽  
Jianrong Qiu ◽  
Youyu Fan ◽  
Hefang Hu ◽  
Congshan Zhu
Keyword(s):  
Femtosecond Laser ◽  
Ultraviolet Light ◽  
Three Dimensional ◽  
Optical Recording ◽  
High Density

We report on long-lasting phosphorescence and photostimulated long-lasting phosphorescence phenomena in femtosecond laser-irradiated Mn2+-doped alumino-phosphofluoride glasses. Long-lasting phosphorescence was observed in the glass samples after the irradiation of the focused femtosecond laser. Photostimulated long-lasting phosphorescence was observed in the femtosecond laser pre-irradiated region by excitation of an ultraviolet light of 365 nm, after the femtosecond laser-induced long-lasting phosphorescence decayed completely. The mechanisms of these phenomena have been discussed. These phenomena have potential uses in three-dimensional ultra-high-density optical recording.

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