| Project/Area Number |
25820366
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
MAEDA KENSAKU 東北大学, 工学(系)研究科(研究院), 助教 (40634564)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 結晶成長 / ホウ酸塩結晶 / 真空紫外光源 / 擬似位相整合 / 双晶境界 / 融液成長 / その場観察 / 結晶粒界 / 真空紫外 / 固液界面 |
|---|
| Outline of Final Research Achievements |
Quasi-phase-matching structure can be achieved in structures where the sign of the nonlinear optical coefficient is periodically reversed; it is made from ferroelectrics by the external electric field. Ferroelectric oxide crystals could not be used for vacuum-UV light source since they are opaque to VUV. Lithium tetraborate is transparent to VUV and non-ferroelectric. In this research, we focused on periodically-twinned lithium tetraborate instead of periodically-poled ferroelectrics. Specifically, we tried followings “improvement of the spot melt method”, “short-period twinned crystal formation by line-shaped melt”, “relationship between crystal growth direction and twin boundary orientation”, “periodic twin formation by using surface manufactured seed crystal”.
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