Abstract
Analyzing and profiling the dopants in laser active materials, especially fibers and preforms is an important task. These information allows you to monitor the preform fabrication and drawn fibers and investigate their quality. It has been show that using micro-spectroscopy and fluorescence lifetime images (FLIM) can be used to detect and quantify erbium ions in silica samples [1]. The gathered lifetimes and spectra are not only used for monitoring the dopants profile, but also to gather data like emission cross-sections for simulations and so predict the fibers behavior for running a laser.
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