Abstract
The laser floating zone (LFZ) technique has been used to grow single crystals of several rare earth silicates from polycrystalline precursors. These polycrystalline ceramics were prepared using both solid state and solution synthesis routes. An oxyorthosilicate (Gd 1− x Nd x ) 2(SiO 4)O, and a hexagonal cation-deficient oxyapatite, La 1− x Nd x ) 9.33□0.6 7(SiO 4) 6O 2, have been characterized by absorption and fluorescene spectroscopy. Several precursors and crystals have been characterized by elemental analysis and X-ray diffraction tecniques, since the crystal optical quality obtained was found to be dependent on the precursor synthesis route. Cryogenic (18 K) and room-temperature absorption and fluorescence spectra are presented for single crystals of high optical quality. These results are interpreted with respect to the active dopant crystallographic sites; applications in diode-laser-pumped solid-state lasers are also discussed.
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