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CaF$_2$:Yb$^{2+}$ and SrF$_2$:Yb$^{2+}$ crystals have been investigated by atwo-color UV + IR transient photoluminescence enhancement technique. Theenhancement gives information about both changes in internal energy levels ofthe excitons and liberation of electrons from traps in the crystals.

Impurity-trapped excitons and electron traps in CaF$_2$:Yb$^{2+}$ and SrF$_2$:Yb$^{2+}$ probed by transient photoluminescence enhancement