Nonlinear coefficients at telecom wavelengths responsible for the optical and terahertz wave interactions in GaSe:S crystals

O. N. Shevchenko; N. A. Nikolaev; V. D. Antsygin

doi:10.1117/12.2687430

26 November 2023 Nonlinear coefficients at telecom wavelengths responsible for the optical and terahertz wave interactions in GaSe:S crystals

O. N. Shevchenko, N. A. Nikolaev, V. D. Antsygin

Author Affiliations +

Proceedings Volume 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X; 127760Z (2023) https://doi.org/10.1117/12.2687430
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

Gallium selenide nonlinear optical crystals are effective up- and down-converters of terahertz and infrared frequencies. Their nonlinear characteristics at the telecommunication wavelength have not received enough attention, particularly for sulfur-doped crystals. In order to close this gap, we put forward data on the optical and electro-optical characteristics of GaSe_(1-x)S_x crystals (where x = 0, 0.03, 0.12, 0.16, and 0.22) at the wavelength of 1.55 micrometers and in the terahertz range. This study provides an estimate of the GaSe:S crystal’s nonlinear coefficient d₂₂(ω₁, ω₂, ω₃) responsible for the terahertz wave generation by means of optical rectification and difference frequency generation, where ω₁ ≈ ω₂ – corresponds to the near infrared range, and ω₃ belongs to the subterahertz frequencies. We assume that the value of d₂₂ lies within the range from 13.9 to 20.5 pm/V for the wavelengths of 0.63 to 1.55μm. The potential of S-doped GaSe crystals to be used as nonlinear optical converters for photonic devices operating at telecom wavelengths is discussed.

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

Citation Download Citation

O. N. Shevchenko, N. A. Nikolaev, and V. D. Antsygin "Nonlinear coefficients at telecom wavelengths responsible for the optical and terahertz wave interactions in GaSe:S crystals", Proc. SPIE 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X, 127760Z (26 November 2023); https://doi.org/10.1117/12.2687430

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