Photoreversible absorption changes have been found in additively colored La-, Ce-, Gd-, or Tb- doped CaF2. Results are shown for one of these, Ce:CaF2, in which both the trivalent and divalent rare-earth absorptions are identifiable. These results suggest a charge transfer between the rare earth and a defect center produced by additive coloration.
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Staebler et al. (1969) studied this question.
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