We found that the Eu3+ ion occupies several distinct sites in Y2SiO5. We were also able to perform hole-burning studies in more than 40 different transitions.

High-resolution spectroscopic study of the F07→5D0 transition revealed more than 40 different sites for the rare-earth ion. The multisite behavior was found to be due to clustering of the dopants and dopant induced microscopic defects. Hole-burning efficiencies were measured for some sites.

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