Terahertz Wave Generation via Nonlinear Parametric Process from ε-GaSe Single Crystals Grown by Liquid Phase Solution Method

Kyosuke Saito, Yuki Nagai, Kunihiko Yamamoto, Kensaku Maeda, Tadao Tanabe, Yutaka Oyama

Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, Japan.
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan.

DOI: 10.4236/opj.2014.48021                

Abstract

Terahertz (THz)-wave generation has been conducted based on difference frequency mixing (DFM) process with phonon-polariton excitation of ε-GaSe single crystals implemented with liquid-phase solution growth using the temperature difference method under controlled vapour pressure for the first time. The type-eoo phase matching condition for the DFM process at around 10 THz is satisfied by changing the incident angle into the crystal. The maximum conversion efficiency in the present DFG process is about 10^-6 J^-1 using a 0.1-mm-thick GaSe single crystal with the only ε- phase polytype, which can be greater than that of the commercially available Bridgman grown GaSe crystal including both ε- and γ-phase polytypes.

Keywords

Terahertz Wave, Nonlinear Optics, Semiconductor Material, Liquid Phase Solution Growth

Conflicts of Interest

The authors declare no conflicts of interest.

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