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.

这项工作致力于研究一种新型非线性晶体Ba ₂ Ga ₈ GeS ₁₆。本文对基于特定晶体的光参量振荡器的调谐特性进行了理论研究。已经确定的是，该晶体中的相位匹配仅对于选定泵浦辐射波长下的 oo-e 类型相互作用是可能的。调谐范围延伸至晶体透明度的长波长极限。为了实现如此宽的调谐范围，必须使用波长为 1.064  \(\mu \hbox {m}\)的激光作为泵浦源，将晶体旋转 19.7 \(^{\circ }\)并旋转 0.83 \(^{\circ }\)使用 1.5 \(\upmu \hbox {m}\)的泵浦波长 。此外，利用R-on-1方法研究了Ba ₂ Ga ₈ GeS _{16晶体的激光损伤阈值。}这种新材料的表面损伤阈值为7 \(\pm\) 0.5J/cm ²，表明其具有较高的抗辐射损伤能力。所获得的激光损伤阈值是新型晶体在高脉冲能量激光系统和非线性光学应用中正确、安全使用的重要指南。高激光诱导损伤阈值与高非线性和一系列透明度相结合，使 Ba ₂ Ga ₈ GeS ₁₆成为各种应用的有前途的材料，包括医疗激光手术，其中非线性材料的高激光诱导损伤阈值具有决定性的重要性。