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Nd3+ or Sm3+ doped oxyfluoride glass based on GeO2–PbO–PbF2. Synthesis and spectroscopic properties

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Author(s): Barbara Klimesz | Grazyna Dominiak-Dzik | Witold Ryba-Romanowski

Journal: Optica Applicata
ISSN 0078-5466

Volume: 35;
Issue: 4;
Start page: 843;
Date: 2005;
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Keywords: oxyfluoride glasses | differential thermal analysis (DTA) | optical properties | Judd–Ofelt analysis | lifetimes

ABSTRACT
Glasses with composition 50 GeO2–(45 – x)PbO–5 PbF2–x LnF3 (Ln = Nd or Sm, x = 0.2 and 2 mol%) were synthesised in the bulk form. Phase profiles and temperature characteristics were measured by differential thermal analysis (DTA); glass transition temperature Tg, as well as the b-PbF2 Tb and oxide glass crystallisation Tc temperatures have been derived for each individual system. A study of optical properties (absorption, emission) of the PbF2–Nd3+ and PbF2–Sm3+ was carried out. The oscillator strengths were obtained for several optical transitions and they have been used to calculate phenomenological intensity parameters W2, 4, 6. The probabilities of radiative transitions from fluorescent levels of Nd3+ and Sm3+ ions, as well as branching ratios and radiative lifetimes, were estimated on the basis of the Judd–Ofelt framework. The fluorescence dynamics of studied systems was measured. Experimental lifetimes were compared and discussed with those obtained with the Judd–Ofelt theory.

Tango Jona
Tangokurs Rapperswil-Jona

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