Abstract
A single crystal is typically used as a laser material for solid state lasers. The laser medium made of a single crystal is generally limited by several factors in fabricating large size crystals and heavily doping optical active elements. For the improvement of these factors, it is proposed to use the polycrystalline medium (ceramics) for the laser. In this study, we evaluated the spatial distribution of Cr ions, which were doped as optically active elements, and the emission spectrum of the element. These measurements were performed with the SNOM (Scanning Near-field Optical Microscope) installed with a spectrum photometer. The fluorescence spectra of Cr ions were measured using this equipment with the spatial resolution of several hundreds nanometers.
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