Journal
JOURNAL OF APPLIED PHYSICS
Volume 106, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3176965
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Funding
- Office of Naval Research, the National Science Foundation
- Department of Homeland Security through the DHS-ALERT Center [2008ST-061-ED0001]
- U.S. Department of Homeland Security
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In this paper we experimentally investigated the birefringence and absorption coefficients of alpha barium borate (alpha-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 alpha-BBO and beta barium borate crystals showed that their phonon frequencies are different and alpha-BBO crystal has smaller refractive index, birefringence, and absorption coefficients in low frequency region. The blueshift behavior of the lowest phonon of the alpha-BBO crystal over the temperature range of 10-293 K has also been characterized. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3176965]
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