The sodium borosilicate glass containing Bi2O3 nanocrystals was synthesized by employing both Sol-Gel and atmosphere control methods. Morphology and microstructure of the Bi2O3 nanocrystals doped in the sodium borosilicate glass were characterized by means of X-ray powder diffraction (XRD), X-ray photoelectron spectroscope (XPS), transmission electron microscope (TEM), energy dispersion X-ray spectra (EDX), scanning transmission electron microscope (STEM), high-resolution transmission electron microscope (HRTEM), and selected-area electron diffraction (SAED). Meanwhile, the third-order nonlinear optical absorption properties of the Bi2O3 nanocrystals glass were investigated by means of the femtosecond open-aperture Z-scan technique under the different excited light intensities at a wavelength of 800 nm. The results show that the Bi2O3 nanocrystals are formed in the sodium borosilicate glass matrix, with dimension less than 10 nm. Moreover, the transformation from saturable absorption to reverse saturable absorption will occur with the increase of the excited light intensities in the glass. Furthermore, the calculated magnitude of the third-order nonlinear susceptibility X(3) ranges from 10-19 to 10-18 m2/V2 in the glass. The results indicate that the glass exhibits the excellent nonlinear optical properties, which have potential applica-tion in the field of nonlinear optics such as optical limiters, etc.%利用溶胶-凝胶法结合气氛控制方式合成了含Bi2O3纳米晶钠硼硅玻璃.利用X射线粉末衍射仪(XRD)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、X射线能量色散谱(EDX)、扫描模式透射电子显微镜(STEM)、高分辨透射电子显微镜(HRTEM)以及选区电子衍射(SAED)对掺杂在钠硼硅玻璃中Bi2O3纳米晶的形貌和微结构进行了表征,同时,利用飞秒开孔Z-scan技术详细地研究了Bi2O3纳米晶玻璃在800 nm处不同激发光强度下的三阶非线性光吸收性质.结果表明,在钠硼硅玻璃中形成了尺寸小于10 nm的Bi2O3单斜晶系纳米晶.随着激发光强度的增强,该玻璃的三阶非线性光吸收性质产生由饱和吸收向反饱和吸收的转变.进一步,计算得到的该玻璃三阶非线性极化率x(3)的数量级范围在10-19～10-18 m2/V2之间.这一结果说明该玻璃具有良好的非线性光学性能,并且在光限幅器等非线性光学领域具有潜在的应用价值.
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