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2 December 2009Yb-doped silica preform precursor nanoparticles and the photodarkening in them
A series of Yb-doped silica-based nanoparticles were fabricated in the MCVD process. Their compositions and doping
levels were well controlled from 0 to 0.53 wt% for Yb and from 0 to 2.1 wt% for Al. The nanoparticles are of about 21.3
± 4.6 nm in size, but their sizes and NIR absorption are influenced by the Al concentration. At a fixed Al doping level,
the NIR absorption depends on the Yb concentration. The nanoparticles exhibit a strong composition dependence of the
photodarkening induced by the X-ray irradiation.
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Liangming Xiong, Edson H. Sekiya, Kazuya Saito, "Yb-doped silica preform precursor nanoparticles and the photodarkening in them," Proc. SPIE 7631, Optoelectronic Materials and Devices IV, 76311E (2 December 2009);