NONLINEAR-OPTICAL PROPERTIES FOR TIO2 CONTAINING PHOSPHATE, BOROPHOSPHATE, AND SILICATE-GLASSES

A theoretical and experimental analysis of the optical properties for titanium-containing glasses is reported. A bond orbital theory elabora ted by M. E. Lines [Phys. Rev. B 41, 3372 (1990); 41, 3383 (1990); 43, 11 978 (1991)] for crystals has been extended to these glasses, where the influence of the Ti-O bond environment has been considered. The r esulting calculated values obtained for linear and nonlinear indices h ave been successfully compared with absolute experimental indices inde pendently measured using a Mach-Zehnder interferometer. This agreement involves an adjustment of a local field factor f, varying from 1 to 1 .2, which emphasizes the importance of the titanium-oxygen environment particularly upon the nonlinear optical properties of the investigate d materials. (C) 1997 American Institute of Physics.