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Title: Enhanced 2.7 μm emission from Er{sup 3+} doped oxyfluoride tellurite glasses for a diode-pump mid-infrared laser

The influence of fluoride and shielding gas (O{sub 2} or Ar) on the physical and spectroscopic properties of Er{sup 3+} doped TeO{sub 2}-ZnO-ZnF{sub 2} glass system is investigated. The larger electronegativity of F than O accounts for the gradual decrease of refractive index, density, and J-O parameters with increasing ZnF{sub 2}. An analysis on Fourier transform infrared transmission spectra reveals that the absorption coefficient of OH{sup −} around 3 μm as low as 0.247 cm{sup −1} can be achieved when 30 mol% ZnF{sub 2} containing sample is treated with Ar gas during glass melting process. The reduction of OH{sup −} groups combined with the low multiphonon relaxation rate (207 s{sup −1}) contributes to the enhanced emissions at 1.5 and 2.7 μm, along with prolonged lifetimes of {sup 4}I{sub 11/2} and {sup 4}I{sub 13/2} levels. A high branching ratio (17.95%) corresponding to the Er{sup 3+}: {sup 4}I{sub 11/2} → {sup 4}I{sub 13/2} transition, the large absorption and emission cross section (0.44 × 10{sup −20} cm{sup 2} and 0.45 × 10{sup −20} cm{sup 2}), and good gain cross section demonstrate that oxyfluoride tellurite glass could be a promising material for a diode-pump 2.7 μm fiber laser.
Authors:
; ; ; ;  [1] ;  [2]
  1. State Key Laboratory of Luminescence Materials and Devices, and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641 (China)
  2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022 (China)
Publication Date:
OSTI Identifier:
22253336
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 4; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; BRANCHING RATIO; CROSS SECTIONS; DENSITY; DOPED MATERIALS; EMISSION; ERBIUM IONS; FOURIER TRANSFORMATION; GLASS; OXYFLUORIDES; SPECTRA; TELLURIUM OXIDES; TRANSMISSION; ZINC FLUORIDES; ZINC OXIDES