Abstract
Thulium doped sodium gadolinium tungstate crystals with sizes of about 20 mm×45 mm were grown successfully by the Czochralski technique along the (001) orientation. X-ray powder diffraction (XRD) of sodium gadolinium tungstate was described and the linear thermal expansion coefficients for the c- and a-axes were measured as 1.60×10-5 and 7.89×10-6 °C-1. Polarized absorption spectra, and fluorescence spectra, as well as fluorescence decay curves of Tm3+-doped NaGd(WO4)2, have been recorded at room temperature and used to calculate the absorption and stimulated emission cross-sections. Based on the Judd–Ofelt theory, three intensity parameters were obtained. The luminescent quantum efficiency of the 3 H 4 level was determined to be approximately 65% for this material. The emission cross-section of the 3 F 4→3 H 6 IR transition at about 1.8 μm was estimated by the reciprocity method.
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78.55.Hx; 65.40.De; 78.20.-e
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Wang, H., Jia, G., Yang, F. et al. Growth and spectral properties of Tm3+-doped NaGd(WO4)2 crystal. Appl. Phys. B 83, 579–585 (2006). https://doi.org/10.1007/s00340-006-2209-y
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DOI: https://doi.org/10.1007/s00340-006-2209-y