Abstract
Ca1−XYbXF2+X crystals were grown by two different methods: simple melting underCF4 atmosphere and the laser heated pedestal growth (LHPG) method underAr atmosphere. Spectroscopic characterization (absorption, emission, Ramanspectroscopy and decay curves) was carried out to identify Stark levels ofYb3+ transitions in the different crystallographic sites of the cubic structure inCa1−XYbXF2+X crystals.The Yb3+ concentration dependence of the experimental decay time was analysed by using concentrationgradient fibre in order to understand involved concentration quenching mechanisms. UnderYb3+ ioninfrared pumping, self-trapping and up-conversion non-radiative energy transfer to unexpected rare earthimpurities (Er3+, Tm3+) has been observed in the visible region and interpreted by a limited diffusion process within theYb3+ doping ion subsystem towards impurities. The main parameters usefulfor a theoretical approach of laser potentiality have been given asτrad = 2.05 ms,N0 = 7.47 × 1021 cm−3 (32 mol%)and Nm = 6.39 × 1021 cm−3 (26.5 mol%).
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