Laser Cooling of a Yb Doped Silica Fiber by 18 Kelvin From Room Temperature
Brian Topper, Mostafa Peysokhan, Alexander R. Albrecht, Angel S., Flores, Stefan Kuhn, Denny Haessner, Sigrun Hein, Christian Hupel, Johannes, Nold, Nicoletta Haarlammert, Thomas Schreiber, Mansoor Sheik-Bahae, Arash, Mafi
TL;DR
This study demonstrates significant laser cooling of a Yb-doped silica fiber, achieving 18.4K below room temperature in vacuum and 3.6K in air, using 20W of 1035nm pump light, with potential applications in thermal management.
Contribution
It introduces a Yb-doped silica fiber with enhanced cooling efficiency enabled by Al codoping, achieving record temperature drops with practical pump power levels.
Findings
Cooling of 18.4K below ambient in vacuum
Cooling of 3.6K below ambient in air
Cooling efficiency of approximately 1.2%
Abstract
A ytterbium doped silica optical fiber has been cooled by 18.4K below ambient temperature by pumping with 20W of 1035nm light in vacuum. In air, cooling by 3.6K below ambient was observed with the same 20W pump. The temperatures were measured with a thermal imaging camera and differential luminescence thermometry. The cooling efficiency is calculated to be 1.2+-0.1%. The core of the fiber was codoped with Al3+ for an Al to Yb ratio of 6:1, to allow for a larger Yb concentration and enhanced laser cooling.
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