Abstract
Refractive indices of CaF2 have been determined by ellipsometry and factors determining the temperature dependence are discussed. Measurements were made on CaF2 single crystal and melt in dehydrated helium atmosphere in the temperature ranges from room temperature to 1050K and from 1600K to 1800 K, respectively. The standard deviation in the measured refractive indices was within ±0.001. The following equations were fitted to the measured refractive indices: Single crystal: n = n298 - 1.541 x 10 -5(T/K - 298) 298K - 1050K, melt: n = n1600 - 4.667 x 10-5(T/K - 1600) 1600K - 1800K, where n298 = 1.429 and n1600 = 1.409. It is likely that the temperature coefficients are determined predominantly by those of the densities.
Original language | English |
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Pages (from-to) | 163-173 |
Number of pages | 11 |
Journal | High Temperatures - High Pressures |
Volume | 37 |
Issue number | 2 |
Publication status | Published - 2008 |
Externally published | Yes |
Keywords
- CaF single crystal and melt
- Ellipsometry and molar electronic polarisability
- Refractive index
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Physical and Theoretical Chemistry