Abstract

We report internal laser cooling in Yb3+-doped KPb2Cl5. From the quantum efficiency values measured in the heating and cooling regions by use of the photothermal deflection technique, we have obtained a room-temperature cooling efficiency of 0.2% in a sample doped with 5×1019 ions/cm3. Excitation spectra obtained under high irradiation fluences show an excess of fluorescence with regard to those obtained at low fluences, which agrees with the prediction of a model based on photon–ion–phonon interaction.

© 2002 Optical Society of America

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