Laser cooling experiments to measure the quantum efficiency of Yb-doped silica fibers
Abstract
A detailed investigation into the wavelength-dependent cooling efficiencies of two ultra-pure large core diameter ytterbium-doped silica fibers is carried out by means of the laser-induced thermal modulation spectroscopy (LITMoS) method. From these measurements, an external quantum efficiency of 0.99 is obtained for both fibers. Optimal cooling is seen for pump wavelengths between 1032 and 1035 nm. The crossover wavelength from heating to cooling is identified to be between 1018 and 1021 nm. The fiber with higher Yb3+ ion density exhibits better cooling, seen by the input power normalized temperature differential.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 15, 2022
- Source ID
- 10.1364/ol.463157
Entities
People
- Alexander Neumann
- Alexander R Albrecht
- Angel S. Flores
- Arash Mafi
- Brian Topper
- Christian Hupel
- Denny Häßner
- Johannes Nold
- Mansoor Sheik‐Bahae
- Nicoletta Haarlammert
- Sigrun Hein
- Stefan Kuhn
- Thomas Schreiber
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Federal Ministry of Research, Technology and Space
- Fraunhofer Institute for Applied Optics and Precision Engineering
- University of New Mexico