Abstract
The two-photon-excitation spectra of Eu2+:CaF2 and Eu2+:SrF2 have been studied at 4.2 K in the region between 24,100cm−1 and 28,100cm−1. Besides a broad two-photon absorption region two groups of sharp lines at 27,600cm−1 and 28,000cm−1 in Eu2+:CaF2 (27,670cm−1 and 28,080cm−1 in Eu2+:SrF2) are identified with the transitions 4f7:8S7/2→4f7:6P7/2,6P5/2. It is shown that the 4f-states of Eu2+ in this host lattice differ significantly in their physical properties from the same states of the isoelectronic Gd3+. For these transitions, however, the calculated two-photon absorption rates are in good agreement with the experiments.
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