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Research

Keywords

bulk single crystals,epitaxy, optoelectronic devices

PublicationsNIMS affiliated publications since 2004.

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日本結晶成長学会, 応用物理学会

Research Center for Electronic and Optical Materials
Title

Crystals for optical isolators & high-brightness white light sources

Keywords

UV-VIS-IR Faraday rotators, Single-crystal phosphors

Overview

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.
Ceramic powder phosphors are used for white lighting by excitation with blue LEDs/LDs. All-inorganic efficient phosphors are needed for high-brightness applications.

Novelty and originality

Improvement of Tb-garnets for IR Faraday rotators and development of new UV-visible Faraday rotators.
Development of new binder-free yellow-green single-crystal phosphors with high conversion efficiency and high thermal stability to realize high-brightness white LEDs/LDs.

Details

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High optical quality fluoride and oxide single-crystals are grown by the Czochralski and Bridgman techniques.
Grown crystals and oriented, cut, and polished for characterization in terms of crystalline quality and optical properties.
Prototypes are fabricated to analyze the performance of actual devices and to get feedback for further development.

Summary

• Tb-Sc-garnets are already incorporated into Yb-amplified fiber-lasers by Fujikura Ltd.
• CeF3 is implemented in commercial UV-VIS optical isolators.
• SCPs are already utilized in high-brightness light sources, and further expansion is foreseen in the next generations of projectors and headlights.

この機能は所内限定です。
この機能は所内限定です。

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