Yb-doped silica preform precursor nanoparticles and the photodarkening in them

Abstract

Yb-doped silica nanoparticles were fabricated in a MCVD process. Their compositions and doping levels were well controlled. The nanoparticles are of about 21.3 ± 4.6 nm in size, and exhibit the Yb3+-absorption in NIR and several photodarkening bands in UV-Vis. The photodarkening strongly depends on the compositions.