Rare-earth Doped Silica Fibers Research Articles

Dual Cherenkov and Scintillation Response to High-Energy Electrons of Rare-Earth Doped Silica Fibers

Dual Cherenkov and Scintillation Response to High-Energy Electrons of Rare-Earth Doped Silica Fibers

MCVD in-situ solution doping process for the fabrication of complex design large core rare-earth doped fibers

We report on the fabrication and characterization of rare-earth doped silica fibers manufactured using an in-situ solution doping technique, which is compatible with conventional modified chemical vapor deposition equipment. The in-situ technique permits significantly more doped layers to be deposited, compared to conventional solution doping, and is directly applicable for the fabrication of large core rare-earth doped fibers suitable for high-power fiber sources. Ytterbium-doped aluminosilicate fibers fabricated using the new in-situ doping technique are reported and the results are compared to fibers fabricated using a conventional solution doping method.

Efficient superfluorescent light sources with broad bandwidth

We demonstrate various efficient broad band light sources at /spl sim/1-/spl mu/m wavelength with a 3-dB bandwidth of up to 65 nm at 108-mW output power, based on rare-earth doped silica fibers and a simple adjustable spectral filter.

Rate Equations for Clusters in Rare Earth-Doped Fibers

We present two rate equation models describing the effects of clusters on rare earth-doped silica fibers. The first one, valid for my cluster size, describes the interaction between clustered ions (cross relaxation) as a nonradiative process. The second model, valid only for large clusters, describes it as a cooperative upconversion process. These models are applied to both Nd- and Er-doped fibers. In the limit of large clusters, the two models predict comparable behavior, which provides the heretofore missing relationship between these two formalisms. Increasing the cluster size is found to significantly reduce the steady-state population of the metastable level and to introduce an increasingly faster and stronger fast component in its relaxation. The model is used to quantify the effect of clusters on the gain of fiber amplifiers and the threshold of fiber lasers. These results can be directly applied to study the impact of clusters of any size on doped fiber devices, as well as cooperative upconversion in highly doped materials.