Refractive indices and optical dispersion of 103 synthetic and mineral oxides and silicates measured by a small-prism technique
Refractive indices and optical dispersion of 103 synthetic and mineral oxides and silicates measured by a small-prism technique
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DOI：
10.1364/josab.14.003299
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发表时间：
1997-12
影响因子：
1.9
通讯作者：
O. Medenbach;R. D. Shannon
中科院分区：
文献类型：
--
作者：
O. Medenbach;R. D. Shannon
本文提出了一种测量小单晶样品光学色散的方法。陶瓷样品架可容纳8个样品，用于制备1-2毫米厚度的样品棱镜。利用该技术，用不确定度n估计为±0.0002的汞镉光源测量了50个合成氧化物和53个矿物晶体在404.7 ~ 643.8 nm范围内的折射率。利用这些折射率计算λ=589.3 nm处的n （nD）和λ=∞处的n (n∞)，得到一元Sellmeier方程1/(n2-1)=-A/λ2+B。弥散值A的范围从~ 50×10-16 m2到~ 200×10-16 m2。对于含有Cu+、Co2+、Fe3+、As3+、Sb3+、Ti4+和V5+的化合物，发现了异常高的分散。计算得到的nD和光轴角（2V）值与文献中列出的实验值吻合较好。讨论了铜（Cu2O）、砷olite （As2O3）、senarmonite （Sb2O3）、Yb2O3、ThO2、gahnite （Zn0.92Fe0.10Mg0.01Al1.97O4）、titanite （Ca1.01Ti0.97Fe0.02Al0.02H0.02SiO5）分散值的偏差。
A technique for measuring the optical dispersion of small single-crystal specimens has been developed. A ceramic sample holder capable of holding eight specimens was used to prepare prisms from samples with thicknesses of 1–2 mm. By this technique, refractive indices of 50 synthetic oxide and 53 mineral crystals were measured from 404.7 to 643.8 nm with a Hg–Cd light source with an uncertainty in n estimated to be ±0.0002. These refractive indices were used to calculate n at λ=589.3 nm(nD) and n at λ=∞(n∞) with the one-term Sellmeier equation 1/(n2-1)=-A/λ2+B. Dispersion values A ranged from ∼50×10-16 m2 to ∼200×10-16 m2. Unusually high dispersion was noted for compounds containing Cu+,Co2+,Fe3+,As3+,Sb3+,Ti4+, and V5+. Calculated nD and the optical axial angle (2V) values agreed well with experimental values listed in the literature. Deviations of dispersion values for cuprite (Cu2O), arsenolite (As2O3), senarmontite (Sb2O3),Yb2O3,ThO2, gahnite (Zn0.92Fe0.10Mg0.01Al1.97O4), and titanite (Ca1.01Ti0.97Fe0.02Al0.02H0.02SiO5) are discussed.