| Project/Area Number |
15K14174
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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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, 金属材料研究所, 助教 (40634564)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 双晶境界 / ホウ酸塩結晶 / 分極反転 / 擬似位相整合 / 結晶成長 / 固液界面 |
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| Outline of Final Research Achievements |
Strontium tetraborate and lithium tetraborate are nonlinear optical crystals and transparent to vacuum-UV light. When periodically-poled structure of those crystals is realized, it will function as a quasi-phase-matching device for vacuum-UV light source. Conventional quasi-phase-matching structure is fabricated by applying external electric field to ferroelectric crystal, however, ferroelectric oxide crystals are opaque to vacuum-UV. In this research, instead of polarization of ferroelectric, twin formation of non-ferroelectric borate crystal is used. Periodically-twinned borate crystals are also expected to work as a quasi-phase-matching device. Especially, I reviewed twin formation mechanism of strontium tetraborate and lithium tetraborate.
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