Abstract
A silica microcapillary preform and a hollow-core anti-resonant optical fiber doped with small-size (<50 nm) Gd2O3:Nd3+ nanocrystals are fabricated by the liquid polymer-salt method for the first time, to our knowledge. Aqueous solutions of gadolinium nitrate and neodymium chloride and a soluble organic polymer (polyvinylpyrrolidone) are used to form Gd2O3:Nd3+ nanocrystals inside the air channels of a preform followed by drawing of an optical fiber. Characterization of microcapillary preforms and optical fibers doped with Gd2O3:Nd3+ nanocrystals is performed with XRD, SEM, optical microscopy and photoluminescence analysis. Basic technological factors affecting structural and luminescent properties of the fabricated materials are considered. Particularly, it is found out that microcapillary preforms and hollow-core anti-resonant optical fibers doped with Gd2O3:Nd3+ nanocrystals demonstrate photoluminescence (emission spectra and luminescence lifetimes) characteristic to Nd3+ ions in metal sesquioxides. In addition, it is revealed that luminescence kinetics in optical fibers is described by two exponential dependences with decay times τ1 = 12 µs and τ2 = 233 µs that can be attributed to the feature of a cubic crystal structure of Gd2O3.
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