Optics Letters, volume 47, issue 14, pages 3608
Laser cooling experiments to measure the quantum efficiency of Yb-doped silica fibers
Brian Topper
1
,
Alexander Neumann
1
,
Alexander Albrecht
1
,
Angel S Flores
2
,
Stefan Kuhn
3
,
Denny Häßner
3
,
Sigrun Hein
3
,
Christian Hupel
3
,
Johannes Nold
3
,
Nicoletta Haarlammert
3
,
THOMAS SCHREIBER
3
,
Mansoor Sheik-Bahae
1
,
Arash Mafi
1
1
University Of New Mexico
|
2
Directed Energy Directorate
Publication type: Journal Article
Publication date: 2022-07-15
Journal:
Optics Letters
scimago Q1
wos Q2
SJR: 1.040
CiteScore: 6.6
Impact factor: 3.1
ISSN: 01469592, 15394794
Atomic and Molecular Physics, and Optics
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.
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