Abstract

We present transmission and phase measurements on a birefringent $\mathrm{Y}\mathrm{Al}{\mathrm{O}}_3$ crystal that is illuminated with linearly polarized terahertz radiation in a broad frequency range $(10{\mathrm{cm}}^{-1}\text{\hspace{0.5em} to}16{\mathrm{cm}}^{-1})$. 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.

© 2009 Optical Society of America

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