Thursday, August 25, 2016

Laser Refrigeration of Ytterbium-Doped Sodium–Yttrium–Fluoride Nanowires

Xuezhe Zhou, Bennett E. Smith, Paden B. Roder, Peter J. Pauzauskie

Sodium yttrium fluoride (β-NaYF4) nanowires (NWs) with a hexagonal crystal structure are synthesized using a low-cost hydrothermal process and are shown to undergo laser refrigeration based on an upconversion process leading to anti-Stokes (blueshifted) photoluminescence. Single-beam laser trapping combined with forward light scattering is used to investigate cryophotonic laser refrigeration of individual NWs through analysis of their local Brownian dynamics.

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