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Frontiers in Optics

Optical Cooling of a Large Core Diameter Yb:SiO2 Fiber to 18K Below Ambient Temperature

Brian Topper, Mostafa Peysokhan, Alexander R. Albrecht, Angel S. Flores, Stefan Kühn, Denny Häßner, Sigrun Hein, Christian Hupel, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, Mansoor Sheik‐Bahae, Arash Mafi

Published Jan 1, 2021• 3 citations
Publisher

Abstract

We present record cooling of Yb:silica by 18.4(3)K in vacuum and 3.57(7)K in air in an optical fiber. The success is attributed to increased Yb concentration and decreased thermal load from a smaller cladding thickness.
DOI
10.1364/fio.2021.jw7a.43

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An Yb3+{\mathrm{Yb}}^{3+}Yb3+-doped optical fiber is laser cooled in vacuo from 298 to 282 K. Cooling results from anti-Stokes fluorescence of the ytterbium ions after optical pumping at a wavelength of 1015 nm. The sample temperature is deduced from the emission spectrum, which is sensitive to the populations in the excited-state multiplet of the ions. The temperature change is limited by the coupling between the fiber and ambient blackbody radiation, as confirmed when samples suddenly exposed to the pump laser are found to exponentially relax towards thermal steady state with the expected time constants.