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Concentration and co-doping dependence of the 4F3/2 to4I11/2 lasing behavior of Nd3+ silica fibers

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Abstract

The lasing characteristics of GeO2-SiO2 fibers made by an MCVD technique which also Incorporates Nd3+ ions have been reported.1 The throe fluorescence bands associated with Nd3+ Ions distributed in the silica host in low concentrations are at 940, 1090, and 1360 nm (4F3/24/11/2 4/13/2, respectively) and, compared with Nd3+ in multicomponent glasses, exhibit shifting to longer wavelengths and spectral broadening. Stone and Burrus2 and Aral et al.3 have shown that the fluorescence spectra are influenced by (a) the Nd3+ concentration and (b) the presence of co-dopants such as Al2O3 and p2O5, which greatly Improves the lasing characteristics of the glass. We report the correlation between Nd3+ concentration, the presence of the P2O5 co-dopant, and the markedly different fiber lasing characteristics. Two typos of host site have been postulated for Nd3+ in pure silica depending on the Nd3+·concentration.

© 1987 Optical Society of America

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