Kosc T Z, Huang H, Kessler T J, Negres R A, Demos S G
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY, 14623-1299, USA.
Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94550, USA.
Sci Rep. 2020 Oct 1;10(1):16283. doi: 10.1038/s41598-020-73163-4.
The Raman tensor of the dominant A modes of the nonlinear optical crystalline material potassium dihydrogen phosphate and its 70% deuterated analog have been ascertained. Challenges in determining the A mode tensor element values based on previous reports have been resolved using a specially designed experimental setup that makes use of spherical crystal samples. This novel experimental design enabled the determination of measurement artifacts, including polarization rotation of the pump and/or scattered light propagating through the sample and the contribution of additional overlapping phonon modes, which have hindered previous efforts. Results confirmed that the polarization tensor is diagonal, and matrix elements were determined with high accuracy.
非线性光学晶体材料磷酸二氢钾及其70%氘代类似物的主要A模拉曼张量已被确定。基于先前报告确定A模张量元素值时所面临的挑战，已通过使用一种专门设计的实验装置得以解决，该装置利用了球形晶体样品。这种新颖的实验设计能够确定测量伪像，包括泵浦光和/或穿过样品传播的散射光的偏振旋转以及其他重叠声子模式的贡献，这些因素此前阻碍了相关研究。结果证实偏振张量是对角的，并且高精度地确定了矩阵元素。
