Abstract By laser selective excitation and thermal cycling techniques, we studied photo-transformations and their reverting processes for the CS(2) center present in deuterated and hydrogenated SrF 2:Pr 3+ crystals. Excitation with a narrow-band laser produces persistent spectral holes and a spectral re-distribution within the inhomogeneously-broadened absorption line. Using a laser with a linewidth comparable to the absorption line we measured both reversible polarized-bleaching reorientations and photo-induced formation of a distinct photoproduct center. We measured the reverting temperatures of both the reoriented centers and photoproduct centers. The temperature for reverting CS∗(2) photoproduct centers is 82 ± 3 K, whereas the temperature for reverting reorientated CS(2) centers is 101 ± 3 K. The reverting temperatures for reorientation are identical for the H − and D − varieties of this center. These results are explained by barrier crossing in asymmetric double-well potentials and the respective barrier energies are estimated.