Brillouin spectroscopy of Nd–Ge co-doped silica fibers

摘要: Abstract The effect of Nd-doping on both the longitudinal acoustic velocity and material damping coefficient (Brillouin spectral width) silica fiber are measured. We find that results in anomalously large changes properties SiO2, such as is greatly exacerbated by incorporation Nd. width increases about 151% per wt% Nd2O3 (for small [Nd]). This very compared to Ge-doping, observed this work. may result from poor coordination SiO2/GeO2 matrix, be considerably different with use co-dopants Al tend improve solubility rare earths. found decrease at a rate 6.1% Nd2O3.