Di- and trivalent ytterbium distributions along a melt-grown CaF2 crystal

The tri- and divalent ytterbium distributions along the length of a CaF2 crystal with a nominal YbF3 content of 0.1 mol % have been assessed by absorption spectroscopy. Using the Gulliver-Pfann equation, the Yb3+ and Yb2+ distribution coefficients have been determined to be k = 0.977 and 0.925, respectively.