Twin formation mechanism of strontium tetraborate and development of vacuum-UV laser light source

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14174
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Tohoku University
• Principal Investigator: Maeda Kensaku 東北大学, 金属材料研究所, 助教 (40634564)
• Project Period (FY): 2015-04-01 – 2017-03-31
• 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

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.

Free Research Field

結晶成長