1 September 2006 Properties of nonlinear optical crystals in the terahertz wavelength region
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Optical Engineering, 45(9), 094002 (2006). doi:10.1117/1.2349516
High-quality crystals of gallium selenide (GaSe) and thallium arsenic selenide (Tl3AsSe3) were successfully grown. The refractive indices were measured in the subterahertz spectral region using time-domain spectroscopy. GaSe has a refractive index of 3.2 and an absorption coefficient of 1 cm–1, along with an absorption peak at 0.6 THz. Tl3AsSe3 clearly shows birefringence, where the refractive indices are 5.0 and 5.4 along the fast and slow axes, respectively. The absorption coefficient is over 3 cm–1 at 0.3 THz, increasing steadily with frequency.
Narsingh B. Singh, Theodore B. Norris, T. Buma, R. N. Singh, M. Gottlieb, D. Suhre, Jack J. Hawkins, "Properties of nonlinear optical crystals in the terahertz wavelength region," Optical Engineering 45(9), 094002 (1 September 2006). https://doi.org/10.1117/1.2349516

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