Preparation and investigation of Tm3+/Ho3+ co-doped germanate-tellurite glass as promising materials for ultrashort pulse laser

摘要

The Tm3+/Ho3+ co-doped germanate-tellurite glasses with good thermal properties were prepared. A flat emission with full width at half maximum (FWHM) = 373 nm at similar to 2 mu m was observed in the prepared glass upon the 808 nm excitation. Besides, the cross-sections of the prepared glass have been calculated, and the relative small peak absorption cross-sections (sigma(abs)) corresponding to the Ho3+: I-5(7) -> I-5(8) is the factor to obtain the flat emission. Moreover, the energy transfer microscopic parameters (C-DA) between RE3+ ions have been investigated and quantitatively explained the observation of the flat and broadband emission. Furthermore, when P = 0.2, the gain coefficient becomes positive which indicates the prepared glasses possess superior gain ability. The results indicate that the prepared glasses could be promising candidate for similar to 2 mu m tunable or ultrashort pulse laser materials. (C) 2017 Elsevier B.V. All rights reserved.