Simpson, David Allan, Gibbs, Keith, Collins, Stephen F, Blanc, Wilfried, Dussardier, Bernard, Monnom, Gerard and Baxter, Gregory W (2008) Visible and Near Infra-red Up-conversion in Tm3+/Yb3+ Co-doped Silica Fibres Under 980 nm Excitation. Optics Express, 16 (18). pp. 13781-13799.

Abstract

The spectroscopic properties of Tm3+/Yb3+ co-doped silica fibers under excitation at 980 nm are reported. Three distinct up-conversion fluorescence bands were observed in the visible to near infra-red regions. The blue and red fluorescence bands at 475 and 650 nm, respectively, were found to originate from the 1G4 level of Tm3+. A three step up-conversion process was established as the populating mechanism for these fluorescence bands. The fluorescence band at 800 nm was found to originate from two possible transitions in Tm3+; one being the transition from the 3H4 to 3H6 manifold which was found to dominate at low pump powers; the other being the transition from the 1G4 to 3H6 level which dominates at higher pump powers. The fluorescence lifetime of the 3H4 and 3F4 levels of Tm3+ and 2F5/2 level of Yb3+ were studied as a function of Yb3+ concentration, with no significant energy back transfer from Tm3+ to Yb3+ observed.

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