Assessment of the application of paratellurite for the acousto-optical deflection of terahertz rays based on broadband spectroscopy data

Komandin, G.A.; Nozdrin, V.S.; Chuchupal, S.V.; Lomonov, V.A.; Pisarevskii, Y.V.; Porodinkov, O.E.; Spektor, I.E.

Авторы: Komandin G.A., Nozdrin V.S., Chuchupal S.V., Lomonov V.A., Pisarevskii Yu V., Porodinkov O.E., Spektor I.E.
Журнал: Journal of Physics D - Applied Physics
Том: 53
Номер: 49
Год издания: 2020
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 1
Последняя страница: 11
Номер статьи: 495102
DOI: 10.1088/1361-6463/abafdc
Аннотация: The rapid spatial guidance of terahertz (THz) radiation is a key problem in modern THz spectroscopy and imaging. Single-crystal α-TeO2 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 suppressed, which is mainly caused by a decrease in first- and second-order phonon contributions. The temperature dependencies of the refraction index and absorption coefficient of paratellurite in the THz range were obtained. We demonstrate that crystal cooling leads to a shift in the high-frequency boundary of the deflected THz radiation from 15 to 40 cm−1 along the [001] crystallographic axis.
Добавил в систему: Чучупал Сергей Вячеславович

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Assessment of the application of paratellurite for the acousto-optical deflection of terahertz rays based on broadband spectroscopy dataстатья

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