Abstract
Single crystal lithium niobate fibers with diameters ranging from 1to3mm have successfully been grown by the micro-pulling-down technique. The fibers are doped with various Er doping levels from 0to0.7mol% and appear to be transparent and crack-free. The study includes x-ray structural investigation and complete spectroscopic characterization. The analysis shows a good homogeneity of composition, and the comparison with bulk crystals demonstrates the good optical quality of the samples. Particular attention has been devoted to the measurements of the fluorescence decay time of the I13∕24 Er level, which has been carried out with a particular technique in order to avoid radiation trapping effects. Results are in agreement with the literature both in the case of bulk crystals and of fibers. Reliable polarized emission cross section in the 1.5μm region are presented.
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