Huang, Jingguo, Yang Li, Yanqing Gao, Zhiming Huang, Nazar Nikolaev, Alexander Mamrashev, Grigory Lanskii, and Yury Andreev. "Terahertz birefringence and dichroism of KTA crystal." Crystals 10, no. 9 (2020): 730.
for full paper see https://www.mdpi.com/2073-4352/10/9/730
Abstract
For the first time, we present the spectra of all three components of the refractive index and
absorption coefficient of the KTiOAsO4 (KTA) crystal measured by the means of terahertz time-domain
spectroscopy in the range of 0.3–2.1 THz. The dispersion of the refractive index is approximated and
presented in the form of the Sellmeier equation. We observe a large birefringence ∆nZ-X ≈ 0.76 and
dichroism which is attributed to a strong absorption peak in the vicinity of ~1.23–1.25 THz for the Z-axis.
However, the crystal can be considered as almost uniaxial due to a close value of nX and nY as well as
αX ≈ αY in the region below 0.5 THz. Moreover, KTA crystals can satisfy the phase-matching condition in
principal XZ-plane for THz emission on difference frequency generation mechanism. Therefore, the crystal
could be considered as an efficient candidate for terahertz wave generator under intense laser pump.
.....The polarized transmission spectra in the terahertz range were carried out via
terahertz time-domain spectrometer (THz-TDS) TeraPulse 4000 (TeraView, Cambridge, UK) at the
temperature of 17 ◦C......
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