Characterization of the new semiorganic nonlinear crystal of guanylurea hydrogen phosphite in the terahertz range

Nazar Nikolaev; Anton Sinko; Sofya Bychkova; Valery Antsygin; Lev Maximov; Fedor Minakov; Alexander Shkurinov

doi:10.1117/12.2687665

26 November 2023 Characterization of the new semiorganic nonlinear crystal of guanylurea hydrogen phosphite in the terahertz range

Nazar Nikolaev, Anton Sinko, Sofya Bychkova, Valery Antsygin, Lev Maximov, Fedor Minakov, Alexander Shkurinov

Author Affiliations +

Proceedings Volume 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X; 1277615 (2023) https://doi.org/10.1117/12.2687665
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

Recently, the semiorganic crystal of guanylurea hydrogen phosphite was revealed as an extremely efficient narrow-band terahertz radiation source. It is proposed that the emission is closely connected with the excitement of high-quality phonon oscillations, which in turn necessitates a detailed characterization of the optical properties of the crystal in this range. The extreme dispersion of the angle between dielectric and crystallographic coordinates, permitted by the monoclinic syngony of the crystal, was estimated to be 2.3° per 100 GHz. The dielectric susceptibility of the crystal measured by means of time-domain spectroscopy is determined by the high-Q phonon at 1.45 THz for E_THz||x, which is responsible for the efficient terahertz generation. Also, two modes were found at 1.02 and 0.92 THz for E_THz||z and E_THz||y, respectively. All three components of the refractive index were measured in the range of 0.4–2 THz. We believe that modification of the crystal structure will allow tuning the characteristics of the narrowband terahertz source based on it.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Nazar Nikolaev, Anton Sinko, Sofya Bychkova, Valery Antsygin, Lev Maximov, Fedor Minakov, and Alexander Shkurinov "Characterization of the new semiorganic nonlinear crystal of guanylurea hydrogen phosphite in the terahertz range", Proc. SPIE 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X, 1277615 (26 November 2023); https://doi.org/10.1117/12.2687665

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