Nonresonant-type homogeneous Bi2O3–B2O3–SiO2 glasses were prepared by melting. The third-order optical nonlinear susceptibility χ(3), which was determined by measurement of third-harmonic generation, increased with increasing concentrations of Bi2O3 in the glass. The maximum χ(3) estimated was 9.3×10−12 esu in glass that contained 92 wt. % of Bi2O3. χ(3) values of these glasses were enhanced by the small optical bandgap. These glasses also exhibited an ultrafast response time, less than 200 fs, when a degenerate four-wave mixing method with a femtosecond laser was used, indicating that the nonlinearity of these glasses originated mainly from pure electronic polarization.
© 1999 Optical Society of America
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
Naoki Sugimoto, Hirohisa Kanbara, Seiji Fujiwara, Koichiro Tanaka, Yutaka Shimizugawa, and Kazuyuki Hirao, "Third-order optical nonlinearities and their ultrafast response in Bi2O3–B2O3–SiO2 glasses," J. Opt. Soc. Am. B 16, 1904-1908 (1999)