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Effect of hydroxyl concentration on Yb luminescence properties in a peraluminous lithium-alumino-silicate glass

Optical Materials Express, ISSN: 2159-3930, Vol: 5, Issue: 2, Page: 430-440
2015
  • 22
    Citations
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  • 21
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    22
    • Citation Indexes
      22
  • Captures
    21

Article Description

Ytterbium doped lithium-alumino-silicate glasses suitable for diode-pumped laser applications were investigated concerning the hydroxyl quenching of the Yb fluorescence. Glasses of the nominal composition 18 mol% LiO, 22 mol% AlO and 60 mol% SiO with variable OH concentrations N (between 0.04 and 6.01 · 10 cm) and Yb concentrations NYb (between 0.1 and 9 · 10 cm) were produced and a direct correlation between spontaneous emission decay rate and the product NYb · NOH was observed. The radiative spontaneous emission rate in the glass host is around 1,000 s (radiative lifetime 1.0 ms) and the microparameter for Yb-Yb energy migration, C, was found to be 1.358·10 cm s. It was calculated that on average 17% of the OH groups in the glass contribute to the quenching of the Yb fluorescence. By analysis of the UV edge of the glass it was concluded that melting under inert conditions leads to reduction of iron impurities to Fe, which can act as quenching sites for the Yb ions and therefore may additionally reduce the energy storage capability of the laser material.

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