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5 March 2021 Laser cooling efficiency of Yb-doped yttrium aluminum oxide crystals
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Abstract
Cooling via efficient emission of anti-Stokes photoluminescence can be utilized to realize novel cooling devices. It has been shown that rare earth-doped materials are good candidates for solid-state laser cooling because of their narrow emission spectra and discrete energy levels. We systematically study laser cooling efficiency of rare earth-doped oxide crystals. The photoluminescence spectrum evidences that the phonon-assisted energy transfer from resonant states to inhomogeneously distributed energy states sensitively depends on temperature. We discuss detailed properties of the cooling efficiency of Yb-doped yttrium aluminum oxide crystals and, furthermore, touch emission properties of their crystal thin films.
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Takashi Kita and Yuta Nakayama "Laser cooling efficiency of Yb-doped yttrium aluminum oxide crystals", Proc. SPIE 11702, Photonic Heat Engines: Science and Applications III, 1170204 (5 March 2021); https://doi.org/10.1117/12.2577443
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