| Project/Area Number |
09650730
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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 | FUKUI UNIVERSITY |
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Principal Investigator |
KUZUU Nobu FUKUI UNIVERSITY,ASSOCIATE PROFESSOR, 工学部, 助教授 (70283158)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Mitsuya FUKUI UNIVERSITY ASSISTANT, 工学部, 助手 (40227179)
IWATA Kazuyoshi FUKUI UNIVERSITY,PROFESSOR, 工学部, 教授 (00020230)
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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 |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Silica Glass / Lumisescence / Laser induced damage / Excimer laser / Surface structure / Defect structure / 破壊機構 / 表面機構 / 照射誘起欠陥 / 分子動力学法 |
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| Research Abstract |
In the term of this project, we obtained the following results :
1. Effect of annealing on a silica glass block with ground surface : By annealing at 1150ﾟC, creation of absorption bands due to defect structures and decrement of OH content were observed near surface. The nature of defects and the amount of the change of OH content strongly depend on the roughness and curvature of the surface.
Excimer-laser-induced emission on ground surface of fused silica : By irradiation with ArF excimer laser, luminescence spectra with peaks at 1.9, 3.2 and around 2.9--2.7 eV were observed. The intensities of the peaks at 1.9 and 3.2 eV were suppressed by Ar+ ion etching.
2. Laser induced damage threshold (LIDT) of fused silica at 1064, 532, 355, and 266 nm :
LIDT at 1064--355 nm were proportional to 0.43-th power of the wavelength. At 266 nm, LIDT was about half. of the extrapolated value by the above relation. This low LIDI is due to two-photon absorption which only occurs at 266 nm.
3. Optical fused silica for vacuum UV : We found that ArF-excimer-laser induced absorption in a soot-remelted silica containing 40 ppm OH and no Cl have relatively high resistance to the excimer lasers and excellent optical transmission in vacuum UV.
4. Molecular dynamics simulations for vitreous silica : A molecular dynamics simulation program considering the covalent bonds was developed.
Based on the above results, we will study the defect structure and mechanism for the fracture on silica glass surface by studying the effect of etching and hear treatments on the excimer-laser-induced luminescence.
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