Abstract
We present transmission and phase measurements on a birefringent YAlO3 crystal that is illuminated with linearly polarized terahertz radiation in a broad frequency range (10 cm\textminus1 to 16 cm\textminus1). The spectra exhibit pronounced and complex Fabry-Perot resonances that depend on the polarization orientation of the incoming light. We present a theoretical description to analyze these data and to obtain the optical constants of the crystal in the terahertz range.
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