Kir'yanov, A V and Siddiki, S H and Barmenkov, Y O and Dutta, D and Dhar, A and Das, Shyamal and Paul, Mukul Chandra
(2017)
Bismuth-doped hafnia-yttria-alumina-silica based fiber: spectral characterization in NIR to mid-IR.
Optical Materials Express, 7 (10).
pp. 3548-3560.
ISSN 2159-3930
Abstract
We report an experimental analysis of new hafnia-yttria-alumina-silica glass based fiber doped with bismuth (Bi), with absorption/fluorescence spectra along with resonant-absorption saturation, fluorescence lifetime, and gain, all adherent to Bi-related active centers (BACs), being measured at laser-diode excitation @ 908, 976, 1069, and 1120 nm, matching the NIR BACs' band. The found spectral laws reveal the optimal on excitation wavelength fluorescence, resonant-absorption bleaching, and gain capacities of the fiber, useful for applications at diode pumping. Besides, we report, for the first time to the best of our knowledge, a new resonant-absorption band of BACs in mid-IR (similar to 2.1 mu m) in the fiber, effectively bleached under the action of low-power in-band excitation, and provide the reasons for its association with co-doping the fiber with hafnium. (C) 2017 Optical Society of America
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