Abstract
In this paper, Φ50 × 50 mm Nd, Ho: NaY0.1Gd0.89(WO4)2 crystals have been successfully grown by Czochralski. The crystal structure, doping concentration, thermal properties, fluorescence spectrum, emission cross section, fluorescence lifetime and energy transfer mechanism of Nd, Ho: NaY0.1Gd0.89(WO4)2 crystals have been systematically studied. The results show that the covalent bond effect of W–O bond makes NaY0.1Gd0.89(WO4)2 crystal have high doping ability. Low thermal expansion coefficient and excellent thermal conductivity reduce the possibility of dislocation defects. Under the excitation of 808 nm light source, a wide emission band at 2 μm is obtained. The absorption cross section, emission cross section and gain coefficient are obtained by absorption spectrum calculation. It shows that the incorporation of Y3+ ions can improve the luminous efficiency, widen the spectral line width and adjust the emission spectrum width. The low output pump threshold, high level lifetime and large absorption cross section of laser show great potential for high power laser systems.
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