Journal of Luminescence
Spectroscopic properties of Ho3+ optical centers in CaF2 crystals at the two-micron laser transition
Kseniia A. Pierpoint, Maxim E. Doroshenko, Olimkhon K. Alimov, A.G. Papashvili, V. A. Konyushkin, Andrei N. Nakladov, A.V. Nekhoroshikh