Abstract
A review is given of a detailed analysis of the fluorescence mechanisms occurring in codoped systems YLiF4(Er3+, Tm3+, Ho3+) after 800 nm laser excitation. The description of the excited-states dynamics is achieved with models based on rate equations and using lifetime data. The emission processes are shown to involve various non-radiative relaxations and energy transfers, and are studied as a function of different parameters such as laser excitation energy, temperature, density of excitation and rare-earth ion concentrations. A good understanding of the various excitation pathways between the impurity ions is obtained and their relative efficiencies are calculated.
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