Abstract

We have observed persistent spectral hole burning in a family of centers in CaF2:Pr3+:D and SrF2:Pr3+:D crystals in which the Pr3+ ion has multiple D-ion near neighbors. The hole burning is caused by light-induced D- motion that leads to persistent changes in the local crystal field of the Pr3+ ion. Depending on the center and the temperature, side-hole or antihole structure is observed that has its origin in the second-order hyper-fine interaction. The variation in the hyperfine splittings between centers is consistent with the separation between the ground state and the first excited state.

© 1992 Optical Society of America

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