Abstract
Yb<sub>2</sub>O<sub>3</sub>doped yttrium-rich alumino-silicate nano-particles
based D- and P- (pentagonal) shaped optical fibers with core diameter ~30–35 µm
are fabricated using the conventional MCVD process and solution doping technique.
Parameters of different stages of the fiber preforms fabrication are optimized to get
uniform distributions of Al, Y, F, and Yb ions in the core region, ensured by the data
of an EPMA analysis. In the presence of small amounts of fluorine, the size of
nano-particles is maintained within 5–10 nm; the EDX data reveal that the nano-particles
are rich in yttrium-alumino-silicate phase and are dispersed uniformly across the
preforms core. The critical parameters of the processes involved at the fibers
fabrication along with the nano-structuring and spectroscopic features are highlighted.
It is shown experimentally that the drawn D- and P- shaped fibers support high laser
efficiency (~80% at 976-nm pumping) and demonstrate negligible
photodarkening.
© 2012 IEEE
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