Spectroscopic investigations of Nd3+doped gadolinium calcium silica borate glasses for the NIR emission at 1059 nm

C. R. Kesavulu, H. J. Kim, S. W. Lee, J. Kaewkhao, N. Wantana, E. Kaewnuam, S. Kothan, S. Kaewjaeng

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

The Nd3+-doped gadolinium calcium silica borate (BSGdCaNd) glasses of composition (55-x) B2O3- 10 SiO2- 25 Gd2O3-10 CaO -x Nd2O3, where x = 0.0, 0.05, 0.5, 1.0, 1.5, 2.0 and 2.5 mol %, have been prepared by conventional melt quenching technique and are characterized through structural, thermal, absorption, emission and decay time measurements. Based on the Judd-Ofelt intensity parameters and radiative properties were determined from the absorption spectrum. The emission spectra recorded for BSGdCaNd glasses gives three emission transitions4F3/2 → 4I9/2(903 nm),4F3/2 → 4I11/2(1059 nm) and4F3/2 → 4I13/2(1334 nm) for which effective bandwidths (Δλeff) and stimulated emission cross-section (σ(λp)) are evaluated. Branching ratios (βR) measured for BSGdCaNd0.5 glass show that4F3/2 → 4I11/2transition is quite suitable for lasing applications. The intensity of emission spectra increases with increase in the concentration of Nd3+ion up to 1.0 mol% and beyond that concentration, quenching is observed. The decay from4F3/2level is found to be non-exponential nature for concentrations of Nd3+ions. The non-exponential curve has been fitted to the Inokuti-Hirayama model to understand the nature of energy transfer process. Hence, the high emission cross-section (1.39 × 10−20 cm2), branching ratio (0.58) and long lifetime (342 μs) indicate that the BSGdCaNd0.5 glass system could be considered as a good candidate for strong NIR lasers at 1059 nm.

Original languageEnglish
Pages (from-to)590-598
Number of pages9
JournalJournal of Alloys and Compounds
Volume695
DOIs
StatePublished - 2017

Keywords

  • 1059 nm emission
  • Gadolinium calcium silica borate glasses
  • Judd-Ofelt parameters
  • Luminescence
  • Optical properties

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