Absorption spectrum of the 1.6 wt. % Tm3+–4.6 wt% Yb3+ co-doped sample.
UC spectrum of the 1.6 wt. % Tm3+–4.6 wt% Yb3+ co-doped sample excited at 950 nm.
(Color online) Dependence of the UC intensity on the excitation pump power. Top line of squares for the 800-nm band, bottom line of squares for the 480-nm band.
(Color online) Scheme of the proposed ETU mechanism.
Integrated intensity of the (a) 480-nm and (b) 800-nm UC emission bands of the Tm3+–Yb3+ co-doped glasses.
(Color online) Luminescence decay of the (a) 2F5/2 level of the Yb3+ ion under direct excitation at 925 nm, (b) 1G4 level of the Tm3+ ion measured at 480 nm, and (c) 3H4 level of the Tm3+ ion measured at 800 nm when excited at 975 nm. Inset shows a detail of the (b) and (c) decays.
Main parameters of the fiber preform glasses used in the study
Characteristic parameters of the RE-rich and RE-poor phases of the core glass
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