Effective segregation coefficient of Er3+ ions in ErF3-doped CaF2 crystals

ErF3-doped CaF2 crystals were grown using the vertical Bridgman method. The optical absorption spectra reveal the characteristic peaks of the Er3+ ions. The dopant distribution along two crystals has been investigated using the optical absorption method. The effective segregation coefficient of the Er3+ ions has been calculated using the classical Scheil relationship between the impurity concentration and the crystal growth conditions. The effective segregation coefficient of the Er3+ions in the CaF2 host depends slightly on the doping concentration, and varies between 0.99 and 1.03, for 0.8 mol % ErF3 and 2 mol % ErF3-doped CaF2 crystals, respectively.