Time-domain Brillouin scattering (TDBS) is a developing technique for imaging/evaluation of materials, currently used in material science and biology. Three-dimensional imaging and characterization of polycrystalline materials has been recently reported, demonstrating evaluation of inclined material boundaries. Here, the TDBS technique is applied to monitor the destruction of a lithium niobate single crystal upon non-hydrostatic compression in a diamond anvil cell. The 3D TDBS experiments reveal, among others, modifications of the single crystal plate with initially plane-parallel surfaces, caused by non-hydrostatic compression, the laterally inhomogeneous variations of the plate thickness and relative inclination of opposite surfaces. Our experimental observations, supported by theoretical interpretation, indicate that TDBS enables the evaluation of materials interface orientation/inclination locally, from single point measurements, avoiding interface profilometry. A variety of observations reported in this paper paves the way to further expansion of the TDBS imaging use to analyze fascinating processes/phenomena occurring when materials are subjected to destruction.

中文翻译：

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用于评估材料界面倾角的时域布里渊散射：在非静压压缩晶体破坏的光声成像中的应用

时域布里渊散射 (TDBS) 是一种正在开发的材料成像/评估技术，目前用于材料科学和生物学。最近报道了多晶材料的三维成像和表征，证明了倾斜材料边界的评估。此处，TDBS 技术用于监测金刚石砧池中非静水压压缩时铌酸锂单晶的破坏。 3D TDBS 实验揭示了由非静水压、板厚度的横向不均匀变化以及相对表面的相对倾斜度引起的具有初始平面平行表面的单晶板的变形等。我们的实验观察结果在理论解释的支持下表明，TDBS 能够从单点测量中局部评估材料界面方向/倾斜度，从而避免界面轮廓测量。本文报告的各种观察结果为进一步扩展 TDBS 成像用途铺平了道路，以分析材料遭受破坏时发生的令人着迷的过程/现象。