Abstract
Absorption measurements of the `as grown', gamma irradiated and thermal annealed LiNbO3 crystals doped with Dy3+ ions for several activator concentrations were performed. It was stated that the positions which the Dy3+ ions occupied in LiNbO3 lattice depend on the dopant concentration. The large ion radius of Dy3+ ion causes it to locate in the interstital position as Dy2+. Dy2+ ions, after exposure to gamma rays as well as thermal annealing, change their valency and become Dy3+. The ESR measurements were performed for trivalent dysprosium. Changes in ESR lines before and after γ exposure at room temperature were not observed.
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