Intermediate excited-state absorption in erbium-doped fiber strongly pumped at 980 nm

We report the observation of fluorescence at 530 to 550 nm from erbium-doped germanosilicate fiber under strong pumping in the 980-nm band. The observed nonlinear dependence on pump power is shown to arise from a sequential two-photon absorption from the ground state to the (4)F(7/2) state through t...

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Bibliographic Details
Published in:Optics letters 1991-12, Vol.16 (24), p.1976-1978
Main Authors: KRUG, P. A, SCEATS, M. G, ATKINS, G. R, GUY, S. C, POOLE, S. B
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
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Summary:We report the observation of fluorescence at 530 to 550 nm from erbium-doped germanosilicate fiber under strong pumping in the 980-nm band. The observed nonlinear dependence on pump power is shown to arise from a sequential two-photon absorption from the ground state to the (4)F(7/2) state through the short-lived (4)I(11/2) intermediate state. Rate-equation modeling shows that the pump power dependence of this intermediate excited-state absorption is influenced by population cycling induced by amplified spontaneous emission in the fiber from the metastable (4)I(13/2) state.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.16.001976