TITLE:
Terahertz Wave Generation via Nonlinear Parametric Process from ε-GaSe Single Crystals Grown by Liquid Phase Solution Method
AUTHORS:
Kyosuke Saito, Yuki Nagai, Kunihiko Yamamoto, Kensaku Maeda, Tadao Tanabe, Yutaka Oyama
KEYWORDS:
Terahertz Wave, Nonlinear Optics, Semiconductor Material, Liquid Phase Solution Growth
JOURNAL NAME:
Optics and Photonics Journal,
Vol.4 No.8,
August
22,
2014
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
10-6J-1using 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.