Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5461436 | Journal of Alloys and Compounds | 2017 | 41 Pages |
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 transitions 4F3/2 â 4I9/2 (903 nm), 4F3/2 â 4I11/2 (1059 nm) and 4F3/2 â 4I13/2 (1334 nm) for which effective bandwidths (Îλeff) and stimulated emission cross-section (Ï(λp)) are evaluated. Branching ratios (βR) measured for BSGdCaNd0.5 glass show that 4F3/2 â 4I11/2 transition 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 from 4F3/2 level 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 Ã 10â20 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
C.R. Kesavulu, H.J. Kim, S.W. Lee, J. Kaewkhao, N. Wantana, E. Kaewnuam, S. Kothan, S. Kaewjaeng,