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Here we report the first experimental evidences of anti-Stokes laser-induced cooling in two different low phonon
erbium-doped matrices: a KPb2Cl5 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 Er3+ ion was excited in the 4I9/2 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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