Spectroscopic Properties of Water Free Nd2O3-Doped Low Silica Calcium Aluminosilicate Glasses

Departamento de Física, Universidade Estadual de Maringá, Av. Colombo 5790, 87020-900, Maringá PR, Brazil
Journal of Non-Crystalline Solids (Impact Factor: 1.77). 11/2000; 277(2-3):73-81. DOI: 10.1016/S0022-3093(00)00316-1


In this work, low silica calcium aluminosilicate glasses (LSCA) doped with different concentrations of Nd2O3 were prepared under vacuum conditions and investigated through spectroscopic measurements. UV, visible and near IR optical absorption spectra, IR luminescence spectra, and fluorescent time decay were measured. Judd–Ofelt model was used in conjunction with these data to calculate intensity parameters and ), emission cross-section, radiative lifetime, branching ratio and fluorescence quantum efficiency. The up-conversion properties of Nd3+ were investigated following excitation, and both visible and UV up-conversion have been observed. These results combined with its high fluorescence quantum efficiency and excellent mechanical properties, suggest that this glass may be a candidate to be used as laser host material for near IR with a further possibility of application in the UV and visible spectral regions.

Download full-text


Available from: Mauro Luciano Baesso, Feb 22, 2015
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this work thermal lens spectrometry is applied to determine the fluorescence quantum efficiency, g, of Nd 2 O 3 -doped low silica calcium aluminosilicate glasses as a function of the temperature. The experiments were performed in the temperature range between 22 and 180 °C. The results showed that the decrease in g observed with increase in the temperature of the samples was larger for the larger Nd 2 O 3 -doping concentrations. This observation indicates that the non-radiative relaxation processes induced by Nd–Nd ion interactions may be the dominant mechanism responsible for the g reduction. The results indicate that the thermal lensing technique is a useful tool to evaluate the effect of the active medium temperature in the performance of laser systems. Ó 2002 Elsevier Science B.V. All rights reserved.
    Full-text · Article · Jun 2002 · Journal of Non-Crystalline Solids
  • [Show abstract] [Hide abstract]
    ABSTRACT: Laser emission at 1077nm (4F3/24I11/2) was demonstrated in Nd3+-doped low silica content calcium aluminosilicate (LSCA) glass under 810-nm pumping by a Ti:sapphire laser. The slope efficiency of the laser emission was found to be 34% with a 20-mW threshold power. The excited-state absorption (ESA) and stimulated emission were measured between 850 and 1520nm. The results showed two ESA bands from 931 to 1070nm (4F3/22D3/2,2G9/2,4G11/2,2K15/2) and from 1160 to 1414nm (4F3/2,4G9/24G7/2,2K13/2). The stimulated emission for the laser transition was found to be 45-nm broad with a peak value of 1.810-20cm2. Thermal and mechanical properties of the LSCA glass were compared to the ED-2 and LHG-8 glasses. While the mechanical properties of the LSCA glass are superior to those of the commercial glasses, its temperature coefficient of optical path length is the highest among the three hosts.
    No preview · Article · Jan 2003 · Applied Physics B
  • [Show abstract] [Hide abstract]
    ABSTRACT: Erbium and ytterbium environments in low-silica calcium aluminate glasses, with nominal composition 58 CaO, 27.1-x Al2O3, 6.9 MgO, 8 SiO2, x Er2O3, or Yb2O3, 0.2⩽x⩽1.5 (mol %), were investigated using x-ray-absorption fine-structure spectroscopy (EXAFS) on the Er and Yb LIII edge. The average Er-O bond separation was found to vary only slightly between 2.24 and 2.21 Å and the Yb-O bond between 2.20 and 2.18 Å. The first-shell coordination number decreased as the rare-earth oxide replaced Al2O3. For Er2O3-doped samples this decrease was about 28%, from 6.5 to 4.7 atoms, whereas for Yb2O3-doped ones it was about 14%, from 6.4 to 5.5 atoms. The decrease in the coordination number is attributed to the difficulty of rare-earth atoms to coordinate a larger number of the nonbridging oxygens that appear as the CaO/Al2O3 ratio decreases. The Debye-Waller factor 2σ2 varied from 0.026 to 0.012 Å2.
    No preview · Article · Mar 2004 · Physical Review B
Show more