Study of the properties of BaGa4Se7 crystal in the terahertz region

The far-infrared properties of a newly grown crystal, BaGa
₄
Se
₇
, were investigated with a THz-TDS system. Refractive indices and absorption coefficients of this material between 0.1THz-1THz were obtained. The measured properties predicts potential application of BaGa
₄
Se
₇
in THz-DFG. THz-DFG using BaGa
₄
Se
₇
was analyzed theoretically and the phase-matching conditions were calculated. It seems that a promising prospect of THz application can be expected by using BaGa
₄
Se
₇
as the NLO crystal.