DOPANT CONCENTRATION DISTRIBUTION OF RARE-EARTH DOPED CAF2 CRYSTALS
Pages 141-144
O. Bunoiu, M. Munteanu, E. Preda, I. Nicoara, M. Stef
Abstract
The segregation coefficient of Er3+and Yb3+ - ions in ErF3 and YbF3-doped calcium fluoride crystals has been determined using the optical absorption method. The RE-doped calcium fluoride crystals were grown by Bridgman method using the home-made crystal growth set-up. Taking into account the relationship between the optical absorption coefficient and the concentration of the impurities in the sample, the effective distribution coefficient of the Er3+ and Yb3+ ions has been calculated. The values of segregation coefficient obtained for these crystals are 1.03 for 0.83 mol% ErF3 doped CaF2 sample and 0.98 for 0.72 mol% YbF3 doped CaF2 crystals.