- Address
- 305-0044 茨城県つくば市並木1-1 [アクセス]
学生受け入れ中
研究内容
- Keywords
bulk single crystals,epitaxy, optoelectronic devices
出版物2004年以降のNIMS所属における研究成果や出版物を表示しています。
公開特許出願
- 酸化物結晶、その製造方法、および、その用途 (2026)
- 酸化物結晶、その製造方法、それを用いたシンチレータ材料、および、その用途 (2026)
- 酸化物結晶、その製造方法、および、その用途 (2026)
所属学会
日本結晶成長学会, 応用物理学会
電子・光機能材料研究センター
novel functional optical crystals
single crystal, crystal growth, scintillators, Faraday rotators, phosphors, piezoelectrics, semiconductors
概要
• Optical isolators are needed for laser machinery, marking, and high-power LDs. New novel Faraday rotators are demanded for higher laser powers and shorter wavelengths.
• Environmentally friendly, high-energy X-ray and compact, high-performance neutron scintillator single crystals are needed to realize a safe and secure society.
新規性・独創性
• Improvement of Tb-garnets for IR Faraday rotators and development of new UV-visible Faraday rotators.
• Materials with high light yield, stable without deliquescence, and capable of large single-crystal growth. Furthermore, development of materials possessing the specific properties required for X-ray and neutron applications.
• Development of novel crystal growth techniques, such as bulk single-crystal growth by hydrothermal synthesis
内容
• (Top) 2-inch diameter Tb₃(Sc,Lu)₂Al₃O₁₂ (TSLAG) single crystal. As a Faraday rotator for laser processing machines, it excels in quality, cost, and performance.
• (Lower left) CeF₃ single crystal Faraday rotator, useful from near-ultraviolet to visible wavelengths.
• (Lower right) CeF₃, PrF₃, and LiREF₄ (RE = Tb, Dy, Ho, Er, Yb) single crystals. Useful as Faraday rotators and laser crystals, covering deep ultraviolet to visible wavelengths.
• (Top) Tb:YTaO₄ (YTO) single crystal grown by the FZ method. Useful as an X-ray scintillator. It is high density, exhibits higher light yield than CdWO₄ single crystals, and is Cd-free, making it environmentally friendly.
• (Lower left) Ce:Li₆Y(BO₃)₃ single crystal, useful as a neutron scintillator. It surpasses Li glass in Li concentration, luminescence, lifetime, and productivity.
• (Lower right) Ce:Lu₁.₈Y₀.₂SiO₅ (LYSO) single crystal grown by hydrothermal synthesis. Compared to crystals grown by the Czochralski method, it features lower defect levels and exclusive Ce³⁺ valency, which is expected to enhance luminescence.
まとめ
• Tb-Sc-garnets are already incorporated into Yb-amplified fiber-lasers by Fujikura Ltd.
• CeF₃ is implemented in commercial UV-VIS optical isolators.
• To realize a safe and secure society, we will accelerate the development of scintillator single crystals, aiming for larger size and higher quality.
• Advancement of single-crystal growth technology by the hydrothermal technique.
