Abstract
Similarities and dissimilarities of holograms recorded in fluorite crystals with color centers that are pure or contain relatively high concentrations of an alkaline impurity (sodium) are considered. It is shown that, in these two cases, the mechanism of recording is the same, but formation of the impurity-vacancy complexes in heavily doped crystals causes certain peculiarities in the types of color centers in the initial crystals and those with holograms and determines specific features of spatial redistribution of centers in the process of recording. These features reduce the diffraction efficiency of holograms in heavily doped crystals compared to pure and weakly activated crystals.
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