Cooling rate calibration and mapping of ultra-short pulsed laser modifications in fused silica by Raman and Brillouin spectroscopy
Cooling rate calibration and mapping of ultra-short pulsed laser modifications in fused silica by Raman and Brillouin spectroscopy
复制标题
DOI：
10.1088/2631-7990/ab9583
复制
发表时间：
2020-09-01
影响因子：
14.7
通讯作者：
Schmidt, Michael
中科院分区：
文献类型：
--
作者：
Bergler, Michael;Cvecek, Kristian;Schmidt, Michael
本文重点介绍了一个新的扩展设置的校准的冷却速率（假想温度）在熔融石英的非弹性光散射和随后使用的特点，在超短脉冲（USP）激光修改的局部冷却速率分布确定的准备。为了确定熔融石英的热历史（例如冷却速率和假想温度），研究了高分辨率非弹性光散射实验（拉曼和布里渊光谱）。进行校准并与现有文献进行比较，以量化由于假想温度变化引起的结构变化。与现有的校准相比，本文提供了一个扩展到更低和更高的冷却速率。使用这套新的校准，我们的特点是USP激光改性熔融石英和计算局部假想温度分布。给出了假想温度（T-f）与冷却速率的关系式。从拉曼分析中推导出在1200 ℃左右的玻璃化转变区域中的最大冷却速率为3000 K min（-1）。布里渊观测对热历史和残余应力都很敏感。通过比较拉曼和布里渊观测结果，我们提取了高空间分辨率的局部残余应力分布。对于第一次，组合的拉曼和布里渊非弹性光散射实验显示的冷却速率和残余应力（玻璃结构的详细行为）的内部和周围的USP激光改性区的局部分布。
This paper focuses on the preparation of a new extended set of calibrations of cooling rate (fictive temperature) in fused silica determined by inelastic light scattering and its subsequent use to characterize the local cooling rate distribution in ultra-short pulsed (USP) laser modification. In order to determine the thermal history (e.g. cooling rate and fictive temperature) of fused silica, high-resolution inelastic light-scattering experiments (Raman and Brillouin spectroscopy) were investigated. Calibrations were performed and compared to the existing literature to quantify structural changes due to a change of fictive temperature. Compared to existing calibrations, this paper provides an extension to lower and higher cooling rates. Using this new set of calibrations, we characterized a USP laser modification in fused silica and calculated the local fictive temperature distribution. An equation relating the fictive temperature (T-f) to cooling rates is given. A maximum cooling rate of 3000 K min(-1) in the glass transition region around 1200 degrees C was deduced from the Raman analysis. The Brillouin observations are sensitive to both the thermal history and the residual stress. By comparing the Raman and Brillouin observations, we extracted the local residual stress distribution with high spatial resolution. For the first time, combined Raman and Brillouin inelastic light scattering experiments show the local distribution of cooling rates and residual stresses (detailed behavior of the glass structure) in the interior and the surrounding of an USP laser modified zone.