Evaluation of Optically Active Cr Ion in Cr : Al_2O_3 Ceramics by SNOM

概要

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A single crystal is nominally used as a laser material for solid state lasers. The laser medium made of a single crystal is generally limited in several factors to fabricate large size crystals and to dope optically active elements heavily. 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, by measuring 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 hundreds nm. The variation of the spatial distribution of optically active Cr ions was observed for different Cr concentrations. It was found that the spatial distribution of optically active Cr ion depended on the doped Cr concentration according to the difference in the segregation behavior of Cr.
東海大学の論文