Abstract
This work is devoted to the study of a new nonlinear crystal Ba2Ga8GeS16. The paper presents a theoretical study of the tuning characteristics of an optical parametric oscillator based on the specified crystal. It has been established that phase matching in this crystal is possible only for the oo-e type of interaction at the selected pump radiation wavelengths. The tuning range extends up to the long-wavelength limit of the crystal transparency. To achieve such a wide tuning range, the crystal must be rotated by 19.7\(^{\circ }\) using a laser with a wavelength of 1.064 \(\mu \hbox {m}\) as a pump source and by 0.83\(^{\circ }\) using a pump wavelength of 1.5 \(\upmu \hbox {m}\). In addition, the laser-induced damage threshold of the Ba2Ga8GeS16 crystal was studied using the R-on-1 method. The surface damage threshold of this new material is 7 \( \pm \) 0.5 J/cm2, indicating its high resistance to radiation damage. The obtained laser-induced damage threshold value is an important guideline for the correct and safe usage of the new crystal in high-pulse energy laser systems and nonlinear optical applications. High laser-induced damage threshold in combination with high nonlinearity and a range of transparency makes Ba2Ga8GeS16 a promising material for various applications, including medical laser surgery, where the high laser-induced damage threshold of nonlinear materials is of decisive importance.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Funding
The research of laser-induced damage threshold was carried out with financial support as a part of the development program of NSTU (Project No. S23-22). The model studies of tuning characteristics were carried out with financial support from the Ministry of Science and Higher Education of the Russian Federation (Project No. FSUS-2020-0036).
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Crystal growing, DB, GSh, GSa; recording the transmission spectrum, NK; computations, AL; carrying out measurements and processing data, EE and AL; writing—original draft preparation, EE and NK; writing—review and editing, AB, EE, NK, DB. All authors have read and agreed to the published version of the manuscript.
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Erushin, E., Kostyukova, N., Boyko, A. et al. Ba2Ga8GeS16: new nonlinear optical crystals with high laser-induced damage threshold for parametric down-conversion in mid-IR. Appl. Phys. B 130, 10 (2024). https://doi.org/10.1007/s00340-023-08152-2
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DOI: https://doi.org/10.1007/s00340-023-08152-2