摘要 : The room temperature near-infrared emission at 1.06 mu m corresponding to the F-4(3/2)-> I-4(11/2) laser transition in Nd3+-doped SiO2-LaF3 transparent glass-ceramics prepared by sol-gel method has been characterized in terms of t... 展开 The room temperature near-infrared emission at 1.06 mu m corresponding to the F-4(3/2)-> I-4(11/2) laser transition in Nd3+-doped SiO2-LaF3 transparent glass-ceramics prepared by sol-gel method has been characterized in terms of the product of emission crosssection and fluorescence lifetime. Stimulated emission cross-sections have been calculated from experimental emission spectra using the Fuchtbauer-Ladenburg equation. The precipitation of LaF3 nanocrystals after heat-treatment, confirmed by X-ray diffraction, induces a significant increment of the 1.06 mu m near-infrared emission compared with the as made sample. An enhancement of emission cross-section of about 10% has been achieved with increasing temperature of heat-treatment of the nano-ceramming process from 800 to 1000 degrees C, which is related to the growth of LaF3 nanocrystals. (c) 2008 Elsevier B.V. All rights reserved. 收起