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Implementation of laser-induced anti-stokes fluorescence power cooling of ytterbium-doped silica glass

: Peysokhan, M.; Rostami, S.; Mobini, E.; Albrecht, A.R.; Kuhn, S.; Hein, S.; Hupel, C.; Nold, J.; Haarlammert, N.; Schreiber, T.; Eberhardt, R.; Flores, A.; Tünnermann, A.; Sheik-Bahae, M.; Mafi, A.

Volltext ()

ACS omega 6 (2021), Nr.12, S.8376-8381
ISSN: 2470-1343
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

Laser cooling of a solid is achieved when a coherent laser illuminates the material, and the heat is extracted by annihilation of phonons resulting in anti-Stokes fluorescence. Over the past year, net solid-state laser cooling was successfully demonstrated for the first time in Yb-doped silica glass in both bulk samples and fibers. Here, we report more than 6 K of cooling below the ambient temperature, which is the lowest temperature achieved in solid-state laser cooling of silica glass to date to the best of our knowledge. We present details on the experiment performed using a 20 W laser operating at a 1035 nm wavelength and temperature measurements using both a thermal camera and the differential luminescence thermometry technique.