Laser cooling of a Yb doped silica fiber by 18 Kelvin from room temperature
Abstract
An ytterbium doped silica optical fiber with a core diameter of 900 µ m has been cooled by 18.4 K below ambient temperature by pumping with 20 W of 1035 nm light in vacuum. In air, cooling by 3.6 K below ambient was observed with the same 20 W 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 A l 3 + for an Al to Yb ratio of 6:1, to allow for a larger Yb concentration and enhanced laser cooling.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 11, 2021
- Source ID
- 10.1364/ol.444709
Entities
People
- Alexander R Albrecht
- Angel S. Flores
- Arash Mafi
- Brian Topper
- Christian Hupel
- Denny Hässner
- Johannes Nold
- Mansoor Sheik‐Bahae
- Mostafa Pouyakian
- Nicoletta Haarlammert
- Sigrun Hein
- Stefan Kuhn
- Thomas Schreiber
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Fraunhofer Institute for Applied Optics and Precision Engineering
- University of New Mexico