23 February 2018 Birefringence, absorption, and optical rectification of a chalcopyrite CdSiP2 crystal in the terahertz frequency regime
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Abstract
Linear and nonlinear terahertz (THz) phenomenon are studied in a cadmium silicon phosphide, CdSiP2, crystal. The ~2 THz phonon mode of the CdSiP2 crystal is probed via THz spectroscopy experiments, allowing phonon-polariton dispersion to be observed in the recorded time-domain signals. In the frequency range of 0.5-2.9 THz, the refractive indices of this uniaxial crystal are determined (allowing the material’s birefringence to be calculated), along with the material’s extinction coefficients. Using a 780 nm central-wavelength pump pulse having a duration of 50 fs, THz generation is achieved in the non-centrosymmetric CdSiP2 crystal. The resulting THz electric field pulse has a bandwidth ranging from 0.07-6 THz. The results of this study suggest CdSiP2 has the potential to find use as low-loss THz waveplates in the frequency range of 0.5-1.9 THz, as well as a broadband THz source.
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B. N. Carnio, K. T. Zawilski, P. G. Schunemann, A. Y. Elezzabi, "Birefringence, absorption, and optical rectification of a chalcopyrite CdSiP2 crystal in the terahertz frequency regime", Proc. SPIE 10531, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI, 105311P (23 February 2018); doi: 10.1117/12.2290739; https://doi.org/10.1117/12.2290739
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