Site-selective laser spectroscopy of deuterated SrF2:Er3+.

Laser selective excitation and optical absorption of deuterated SrF2:0.05% Er3+ crystals have revealed eight Er3+ ion centers involving D- ion charge compensation, nine new Er3+–F- centers not associated with D- ions and several approximately cubic symmetry Er3+ centers. In contrast to the trigonal symmetry of the principal F- center, the dominant arrangements in the D- ion charge compensation case are derived from a tetragonal symmetry center. Detailed spectroscopic results for the new centers are presented. Fluorescence polarization ratios are listed for three centers ( J, B, and G1) present in either SrF2:Er3+ or CaF2:Er3+ and crystal-field analyses of these, based on assumed trigonal symmetry, are also reported. [ABSTRACT FROM AUTHOR]