| Project/Area Number |
09650734
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
NOGAMI Masayuki Nagoya Institute of Technology, Faculty of Engineering, Professor, 工学部・材料工学科, 教授 (90198573)
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| Co-Investigator(Kenkyū-buntansha) |
HAYAKAWA Tomokatsu Nagoya Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (00293746)
KASUGA Toshihiro Nagoya Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30233729)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | spectral hole burning / glass / rare-earth / memory / sol-gel |
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| Research Abstract |
Persistent spectral hole burning (PSHB) phenomenon of Eu^<3+> and Sm^<2+> ions is one of the most significant optical properties for use in high-density frequency-domain optical data memory. For practical use, high temperature PSHB and stable hole are required. As a host material, glasses are thought to be more favorable than crystals, because of their wide inhomogeneous width, compositional variety and easy mass production. We focused on the preparation of high temperature PSHB glasses using a sol-gel method and succeeded in preparing aluminosilicate glasses doped with Sm^<2+> and Eu^<3+> ions exhibiting PSHB up to 300 and 210 K, respectively. The conclusions of our research are summarized as follows ;
(1) Sm^<2+> and Eu^<3+>-doped silica and aluminosilicate glasses were prepared by heating the gels synthesized from metal alkoxides and nitrates of rare-earth.
(2) PSHB was observed on the excitation spectra of the ^7F_0*^5D_0transition of the Eu^<3+> and Sm^<2+> ions. The hole depth proportionally increased as the content of hydroxyl bonds increased.
(3) PSHB was formed by both the photo-induced rearrangement of the OH bonds and the photoionization of Sm^<2+> ions, and the holes burned by the rearrangement of the OH bonds surrounding the Sm^<2+> and Eu^<3+> ions and the holes burned by the rearrangement of the OH bonds were thermally refilled
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