1997 Fiscal Year Final Research Report Summary
SECOND HARMONIC GENERATION FROM BULK SILICATE GLASSES AFTER HIGH VOLTAGE POLING
| Project/Area Number |
08455408
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
無機工業化学
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| Research Institution | MIE UNIVERSITY |
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Principal Investigator |
NASU Hiroyuki MIE UNIVERSITY FACULTY OF ENGINEERING,DEPARTMENT OF CHEMISTRY,ASSOCIATE PROFESSOR, 工学部, 助教授 (20189179)
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| Co-Investigator(Kenkyū-buntansha) |
HASHIMOTO Tadanori MIE UNIVERSITY FACULTY OF ENGINEERING,DEPARTMENT OF CHEMISTRY,ASSISTANT, 工学部, 助手 (10271016)
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| Project Period (FY) |
1996 – 1997
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| Keywords | BULK GLASS / SILICATE GLASS / OPTICAL NONLINAERITY / SECOND HARMONIC GENERATION / POLING TREATMENT / ポーリング処理 |
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| Research Abstract |
The glasses have been believed optically isotropic and should not generate second harmonic wave. Recently, it has been found that second harmonic generation has been observed from SiO_2 glass after the thermal poling. We found that the second harmonic generation intensity of SiO_2 glasses prepared by various techniques depended on the OH concentration in the glasses, and SiO_2 glasses with high concentration of OH such as sol-gel derived SiO_2 glasses showed very strong second harmonic generation.
We also found that the addition of the TiO_2 caused second harmonic generation. From the research of the structure by, for instance, extened X-ray absorption fine structure, the intensity of second harmonic generation depended on Ti^<4+> in five-fold cordination of pyramid structure. Similarly, the addition of Ga_2O_3 or PbO caused second harmonic generation. In the case of PbO-SiO_2 glass, the intensity maximum appeard near 50mol% PbO,and the further increase of PbO content reduced the intensity. From the viewpoint of the chemical bond nature, the covalency of Pb-O bond increases from 50mol% PbO from the literature, and thus the chemical bond nature seems to affect the intensity of second harmonic generation.
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