Structure of sol-gel-derived PbO-TiO2 amorphous monoliths with high third-order optical nonlinearity

Hiroyuki Nasu; Kanichi Kamiya; Yuji Katagiri; Seitaro Makino; Jun Matsuoka

doi:10.1117/12.188977

13 October 1994 Structure of sol-gel-derived PbO-TiO₂ amorphous monoliths with high third-order optical nonlinearity

Hiroyuki Nasu, Kanichi Kamiya, Yuji Katagiri, Seitaro Makino, Jun Matsuoka

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Proceedings Volume 2288, Sol-Gel Optics III; (1994) https://doi.org/10.1117/12.188977
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

The PbO-TiO₂ amorphous monoliths with TiO₂ content from 60 to 80 mol% were prepared by the sol-gel method. The amorphous monoliths obtained were somewhat porous, but had a high refractive index of more than 2.0. The third-order optical nonlinear susceptibility, (Chi) ⁽³), of them evaluated from third-harmonic generation (THG) was 5.7 X 10^-13 esu for the transparent monolith containing 60 mol% TiO₂, and increased with increasing TiO₂ content. The largest (Chi) ⁽³) was 1.4 X 10^-12 esu, for the monolith with 80 mol% TiO₂. Ti-K edge x-ray absorption (XANES and EXAFS) analyses were carried out for gels and heat-treated monoliths. XANES spectra of Ti were very similar to that of crystalline PbTiO₃ in which Ti is coordinated with six oxygen atoms. Similarly, EXAFS analysis on the basis of Fourier transformation and double-shell fitting method revealed sixfold Ti atoms both in the heated products and even in gels.

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Hiroyuki Nasu, Kanichi Kamiya, Yuji Katagiri, Seitaro Makino, and Jun Matsuoka "Structure of sol-gel-derived PbO-TiO₂ amorphous monoliths with high third-order optical nonlinearity", Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); https://doi.org/10.1117/12.188977

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