Regular Trends of Acousto-Optic Interaction in Terahertz Region of Electromagnetic Radiation

Nikitin, P. A.; Voloshinov, V. B.; Gerasimov, V. V.; Knyazev, B. A.

doi:10.12693/aphyspola.127.49

Cited by 3 publications

(1 citation statement)

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“…Mechanical and optical deflectors are used to scan fixed samples. In addition to micromechanical scanners [11], acousto-optical devices in which diffraction effects determine changes in the direction of propagation of THz radiation [12] have shown significant promise. Acousto-optical deflection is based on spatial changes in the refractive index of a substance generated by ultrasonic waves.…”

Section: Introductionmentioning

confidence: 99%

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

Komandin¹,

Nozdrin²,

Chuchupal³

et al. 2020

J. Phys. D: Appl. Phys.

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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.

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Section: Introductionmentioning

confidence: 99%