Upconverting nanoparticles (UCNPs) compose a class of luminescent materials that utilize
the unique wavelength-converting properties of lanthanide (Ln) ions for light-harvesting …

In recent years, optical fibers have found extensive use in special environments, including
high-energy radiation scenarios like nuclear explosion diagnostics and reactor monitoring …

Using a combination of experimental techniques such as optical absorption, Raman
scattering, continuous wave and pulse Electron Spin Resonance (ESR), we characterize a …

We have investigated the radiation induced absorption (RIA) of optical fibers with high active
ion concentration. Comparing our results to the literature leads us to the conclusion that RIA …

In this work we present experimental evidence that the valence instability of the ytterbium ion
play a key role for the observed photodarkening mechanism in Yb-doped fiber lasers …

The photo darkening (PD) absorption spectra from unseeded amplifier operation (by 915 nm
pum**) of ytterbium/aluminum and co-doped silica fibers is after prolonged operation …

Ytterbium (Yb) doped silica fibers are widely used in high power fiber lasers where co-
do** the silica core material with other elements is pivotal for high efficiency, low …

The influences of Ce on the radiation resistance of Yb-doped aluminosilicate glasses were
investigated. The Ce ions in silicate glasses can effectively trap holes and free electrons due …

We present an original experimental approach to the investigation of radiation-induced
attenuation (RIA) mechanisms in optical fiber preforms. This protocol combines thermally …

The gain of erbium-doped fiber amplifiers is damaged by irradiation partly because of
creation of color centers responsible of excess absorption at pump and signal wavelengths …