Laser Refrigeration of Optically-Insulated Cryophotonic Nanocrystals
Technical Report,15 Jul 2012,29 Dec 2015
University of Washington Seattle United States
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The demonstration of anti-Stokes laser refrigeration to cryogenic temperatures with macroscopic YLF crystals doped with Yb3 rare-earth ions has resulted in a new approach for solid state laser refrigeration. There are remarkable changes in a materials density of states electron, phonon, or photon, optical absorption, radiative lifetime, thermal conductivity, and light scattering properties when the materials size is reduced below optical wavelengths. One outstanding question in the field is the extent to which a nanoscale YLF crystals size and morphology will enhance its external radiative quantum efficiency and subsequent performance in solid state laser refrigeration.
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