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Title: Photo-acoustic spectroscopy and quantum efficiency of Yb{sup 3+} doped alumino silicate glasses

In this contribution, we analyze the effect of several preparation methods of Yb{sup 3+} doped alumino silicate glasses on their quantum efficiency by using photo-acoustic measurements in comparison to standard measurement methods including the determination via the fluorescence lifetime and an integrating sphere setup. The preparation methods focused on decreasing the OH concentration by means of fluorine-substitution and/or applying dry melting atmospheres, which led to an increase in the measured fluorescence lifetime. However, it was found that the influence of these methods on radiative properties such as the measured fluorescence lifetime alone does not per se give exact information about the actual quantum efficiency of the sample. The determination of the quantum efficiency by means of fluorescence lifetime shows inaccuracies when refractive index changing elements such as fluorine are incorporated into the glass. Since fluorine not only eliminates OH from the glass but also increases the “intrinsic” radiative fluorescence lifetime, which is needed to calculate the quantum efficiency, it is difficult to separate lifetime quenching from purely radiative effects. The approach used in this contribution offers a possibility to disentangle radiative from non-radiative properties which is not possible by using fluorescence lifetime measurements alone and allows an accurate determination ofmore » the quantum efficiency of a given sample. The comparative determination by an integrating sphere setup leads to the well-known problem of reabsorption which embodies itself in the measurement of too low quantum efficiencies, especially for samples with small quantum efficiencies.« less
Authors:
; ; ;  [1] ; ; ; ;  [2] ; ; ; ;  [3] ; ;  [3] ;  [4]
  1. Otto-Schott-Institute of Materials Research, Jena University, Fraunhoferstr. 6, 07743 Jena (Germany)
  2. Otto-Schott-Institute of Materials Research, Jena University, Löbdergraben 32, 07743 Jena (Germany)
  3. Institute of Optics and Quantum Electronics, Jena University, Max-Wien-Platz 1, 07743 Jena (Germany)
  4. (Germany)
Publication Date:
OSTI Identifier:
22489451
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACOUSTIC MEASUREMENTS; DOPED MATERIALS; FLUORESCENCE; FLUORINE; GLASS; MELTING; QUANTUM EFFICIENCY; QUENCHING; REFRACTIVE INDEX; SPECTROSCOPY; YTTERBIUM IONS