Abstract
In this work the optical properties of Yb3+ ions in LiNbO3 crystals are studied as a function of temperature from 15 K to room temperature. The population of the upper Stark levels in each state increases with temperature and subsequently thermal bands appear in the absorption and fluorescence spectra. The intensity of a thermally activated absorption band fits well the Boltzmann profile. Efficient anti-Stokes photoluminescence is observed when pumping transitions starting from the excited Stark levels of the 2F7/2 state. An increase of the decay time versus temperature is observed in the case of moderate Yb3+ concentration. It is related to a luminescence trapping mechanism since a different behaviour is observed for less doped samples.
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