Abstract
In this paper we experimentally investigated the birefringence and absorption coefficients of alpha barium borate (α-BBO) crystal in the range of 0.3–10 THz by using a broadband air photonic terahertz time-domain spectrometer in both transmission and reflection modes. Several phonon modes were observed for o and e beams. The highest phonon mode at 6.8 THz has absorption coefficient of 1000 cm−1. The comparison between the optical properties of the α-BBO and beta barium borate crystals showed that their phonon frequencies are different and α-BBO crystal has smaller refractive index, birefringence, and absorption coefficients in low frequency region. The blueshift behavior of the lowest phonon of the α-BBO crystal over the temperature range of 10–293 K has also been characterized.
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