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15 March 2007 Anti-Stokes laser cooling in erbium-doped low-phonon materials
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Angel J. Garcia-Adeva, Rolindes Balda, and Joaquin Fernández "Anti-Stokes laser cooling in erbium-doped low-phonon materials", Proc. SPIE 6461, Laser Cooling of Solids, 646102 (15 March 2007);

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