Novel approach for solid state cryocoolers

Laser cooling in solids is based on anti-Stokes luminescence, via the annihilation of lattice phonons needed to compensate the energy of emitted photons, higher than absorbed ones. Usually the anti-Stokes process is obtained using a rare-earth active ion, like Yb. In this work we demonstrate a novel...

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Bibliographic Details
Published inOptics express Vol. 23; no. 7; pp. 8216 - 8226
Main Authors Volpi, Azzurra, Di Lieto, Alberto, Tonelli, Mauro
Format Journal Article
LanguageEnglish
Published United States 06.04.2015
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Summary:Laser cooling in solids is based on anti-Stokes luminescence, via the annihilation of lattice phonons needed to compensate the energy of emitted photons, higher than absorbed ones. Usually the anti-Stokes process is obtained using a rare-earth active ion, like Yb. In this work we demonstrate a novel approach for optical cooling based not only to Yb anti-Stokes cycle but also to virtuous energy-transfer processes from the active ion, obtaining an increase of the cooling efficiency of a single crystal LiYF(4) (YLF) doped Yb at 5at.% with a controlled co-doping of 0.0016% Thulium ions. A model for efficiency enhancement based on Yb-Tm energy transfer is also suggested.
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content type line 23
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.23.008216