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テラヘルツ光の高強度化とその利用研究への展開

Intense THz pulse generation and its application

坪内 雅明

Tsubouchi, Masaaki

光と電波に挟まれた周波数領域にあるテラヘルツ光は「未踏領域」として長年その発生、検出手法の開発が進められてきた。近年の非線形光学に基づく波長変換技術の飛躍的な発達により、現在は比較的容易に高強度テラヘルツ光を発生させることが可能となり、その応用研究も急速に進められている。本稿では、テラヘルツ光の特性や基礎的なテラヘルツ光学を概観した後、高強度テラヘルツ光発生手法とその利用研究について研究を交えて解説する。

A novel design for a contact grating device with an incorporated Fabry-Perot resonator is proposed for high-power terahertz light (THz) generation. We deposited a multilayer consisting of Ta$$_{2}$$O$$_{5}$$ and Al$$_{2}$$O$$_{3}$$ on a magnesium-doped stoichiometric LiNbO$$_{3}$$ substrate and fabricated grating grooves on the outermost layer. The multilayer was designed such that conditions for a Fabry-Perot resonator were satisfied for light diffracted by the grating. Consequently, the diffraction efficiency was enhanced by the resonator. The diffraction efficiency of the fabricated device was 71%. THz light generation was also demonstrated with the contact grating device.

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