A study of nonlinear optical properties in Bi2O3-WO3-TeO2 glasses

作者：Chen Yanfei^*; Nie Qiuhua; Xu Tiefeng; Dai Shixun; Wang Xunshi; Shen Xiang

来源：Journal of Non-Crystalline Solids, 2008, 354(29): 3468-3472.

DOI：10.1016/j.jnoncrysol.2008.03.005

• band structure
• heavy-metal oxides
• nonlinear optics
• tellurites

A series of bismuth tungsten tellurite glasses were prepared and their densities, linear refractive indices and transmission spectra were measured. The optical bandgaps E-opt and Urbach energies E-e of glasses were obtained from ultraviolet absorption edges. Both the optical gap (E-opt) and the band tail (E-e) are behaving oppositely. As the value of E-opt decreases with increasing WO3 content, the degree of disorder increases which causes more defects or localized states resulting in deep localized in the bandgap with the tailing increased. Z-scan technique was carried out to investigate the third-order nonlinear optical properties of Bi2O3-WO3-TeO2 glasses. The third-order optical nonlinearity increases with decreasing the optical bandgap E-opt, since a increase of WO3 content can provide the non-bridging oxygen ion content.

• 出版日期2008-7-1
• 单位宁波大学