The double‐doped CaF2:(0.14 mol% ErF3,1.31 mol% YbF3) and CaF2:0.12 mol%ErF3 crystals were grown in our crystal research laboratory using the vertical Bridgman method. The Judd‐Ofelt intensity parameters Ω2,Ω4, and Ω6 for f−f transitions of Er3+ ions were determined from the optical absorption spectra using various groups of transitions. Using the J‐O parameters the radiative transition probability, oscillator strength, branching ratio and radiative lifetime of Er3+ transitions have been calculated. The radiative transition probability and radiative lifetimes are compared to those of Er3+ transitions in other hosts.

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