Abstract
Neodymium-doped calcium tungstate and yttrium aluminium garnet crystals have been grown by the Czochralski technique for use in lasers. It has been found that the spectroscopic properties of these materials (absorption spectra, fluorescent line-widths and lifetimes of the neodymium ion etc.), were not in general sample-dependent and that the variations in laser performance were related to structural imperfections such as optical inhomogeneity, strain and dislocation density, in the case of calcium tungstate, and “coring” and impurity controlled colour centres in YAG. The quality of calcium tungstate can be improved by refinements to the growth technique and by post growth heat treatment giving considerably improved laser performance. The colour centre effect in YAG has been analysed in some detail and can be eliminated in most crystals although the precise nature of the centre has not yet been establihed.
Published Version
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