Abstract
The spectroscopic properties of Tb3+ doped borosilicate glasses were investigated to assess their potential as gain media in the 0.54μm band. Analysis of the concentration and temperature dependences of the optical transitions from the D45 level of Tb3+ was carried out. The emission lifetime of the D45 level at 300K was found to be 2.61±0.03ms and almost invariant for Tb3+ concentrations less than 15wt% (1.68×1021ions∕cm3). Judd-Ofelt analysis was used to calculate the emission transition probabilities from the D45 level, and the emission cross section at 300K for the D45→F57 transition was 8.1×10−22cm2 at 541nm. Temperature dependent nonradiative relaxation of the D45 level was observed in samples with 5 and 20wt% Tb3+. The quenching process of the D45 level in the temperature range of 50–373K might have been caused by a two-photon one-site resonant process, whereas it was dominated by a two-site nonresonant process at temperatures below 40K. The results obtained indicate that Tb3+ doped borosilicate glass is a promising candidate for optical gain media in the green (0.54μm) band.
Published Version
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