Abstract
Persistent spectral hole burning has been observed on the zero-phonon lines of the main and several perturbed sites of Eu 2+ in CaS: Eu single crystals. Hole burning occurs by two-step photoionization, can be strongly gated with IR irradiation, and takes place by excited-state absorption from the metastable 4f 65d excited state to the conduction band followed by electron transport to Eu 3+ centers which are the dominant traps. Unusually broad ~ 100 GHz wings were observed in hole spectrum for perturbed Eu 2+ sites. This is explained by a new off-resonant hole-burning mechanism due to the linear Stark effect of inversionless Eu 2+ sites in time-varying internal Coulomb fields produced by dynamical recharging of Eu ions in the course of hole-burning process.
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