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Spectral Properties of Er(3+)/Tm(3+) Co-Doped ZBLAN Glasses and Fibers.
Materials 2017 May 4
A series of Er(3+)/Tm(3+) co-doped fluoride (ZBLAN) glasses and fibers was prepared and their fluorescence spectra was measured under excitation at 793 nm and 980 nm. Correlation between the self-absorption effect of rare-earth ions and the shift of the emission peak was investigated. With the increasing length of fiber, the emission peaks red-shift when self-absorption occurs at the upper level of emission transition or blue-shift when that occurs at the lower level. As a result of the strong self-absorption effect, Er(3+)/Tm(3+) co-doped fibers mainly yield 1390-1470, 1850-1980, and 2625-2750 nm emissions when excited at 793 nm, and 1480-1580, 1800-1980, and 2625-2750 nm emissions when excited at 980 nm. Further, a broadband emission in the range of 1410-1580 nm covering the S + C communication band was obtained by the dual-pumping scheme of 793 nm and 980 nm. Results suggest that the dual-pumping scheme would be more effective and important for an Er(3+)/Tm(3+) co-doped fiber amplifier working in the S + C communication band.
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