Abstract

The absorption spectra and microscopic images of calcium precipitates in CaF2 crystals additively colored in a heat-pipe setup at various coloring regimes are studied. The effect of two main parameters of coloring procedure, calcium vapor pressure and temperature, is found to be different. Higher values of both parameters increase the number of anion vacancies and electrons introduced into the crystal during the procedure, hence increasing also the concentration of calcium precipitates formed at the transformation of accumulations of these components. However, the pressure rise results in the concentration growth of calcium ions converted into colloidal particles, while the increase of temperature produces mainly calcium rods. The specific features of a surface layer of colored crystal depending on coloring regime are discussed.

© 2018 Optical Society of America

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Supplementary Material (2)

NameDescription
» Visualization 1       A series of natural color wide-field microscopic views obtained while refocusing/submerging into the additivelycolored CaF2 crystal. The LSM images show the presence of relatively large colloids.
» Visualization 2       A series of natural color microscopic views of the additively-colored CaF2 bulk at different focusing depths obtained is presented. LSM images validate the presence of colloids and rods. Neighboring rods tend to arrange along preferential directions.

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