Abstract
Here we report the first experimental evidences of anti-Stokes laser-induced cooling in two different low phonon erbium-doped matrices: a KPb<sub>2</sub>C<sub>l5</sub> crystal and a fluorochloride glass. The local cooling was detected by using a photothermal deflection technique whereas the bulk cooling was detected by means of a calibrated thermal sensitive camera. The Er<sup>3+</sup> ion was excited in the <sup>4</sup>I<sub>9/2</sub> manifold. It is worthwhile to mention that the cooling was observed in the spectral region where some upconversion processes that initiate at the pumped level occur. Together with the spectroscopic characterization, a short discussion on the experimental and theoretical background of the cooling process including the possible influence of upconversion processes is presented.
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