The rapid spatial guidance of terahertz (THz) radiation is a key problem in modern THz spectroscopy and imaging. Single-crystal α -TeO 2 has advanced optical and elastic characteristics. This crystal widely used in acousto-optical devices in the visible and near-infrared (IR) ranges. Its application in the THz frequency range at temperatures of approximately 300 K is limited by high radiation absorption. We studied the electrodynamic characteristics of a paratellurite crystal in a wide frequency region at temperatures ranging from 77 to 300 K using pulsed broadband THz spectroscopy and IR Fourier spectroscopy. The temperature evolution of the complex refractive index, as well as the impact of phonon contributions and second-order processes on the absorption of radiation for polarisation along the crystallographic directions of [001] and [110], was evaluated. It was determined that at temperatures below 100 K, intrinsic absorption processes are significantly suppr...

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基于宽带光谱数据评估星云在太赫兹射线声光偏转中的应用

太赫兹（THz）辐射的快速空间引导是现代THz光谱学和成像中的关键问题。单晶α-TeO 2具有先进的光学和弹性特性。这种晶体广泛用于可见光和近红外（IR）范围的声光设备中。它在大约300 K的THz频率范围内的应用受到高辐射吸收的限制。我们使用脉冲宽带太赫兹光谱和红外傅里叶光谱研究了在温度范围为77至300 K的宽频率范围内的星状卫星晶体的电动力学特性。复折射率的温度演化，以及声子贡献和二阶过程对沿[001]和[110]晶体学方向极化的辐射吸收的影响，被评估。已确定，在低于100 K的温度下，固有吸收过程明显优于...