Neodymium-substituted bismuth titanate (Bi 3 NdTi 3 O 12 , BNT) thin films were prepared on quartz substrates by a metal-organic solution deposition process. The crystalline structure was evaluated by X-ray diffraction. Waveguide property was investigated by using prism coupling technique and optical transmittance measurement. The optical nonlinearities of the film were measured by the top-hat Z-scan techniques and a large positive nonlinear refractive index, nonlinear refractive coefficient and two-photon absorption coefficient were determined to be 3.84×10 -7 esu, 0.7523 cm 2 /GW and 4.81×10 4 cm/GW, respectively. These results reveal that the BNT film may be a kind of new multifunctional materials.
Silicon oxycarbide thin film was prepared by magnetron sputtering on BK7 glass, namely, K9 glass. And the wavelength dependence of refractive index was determined by the envelop method and Wemple and Didomenico dispersion relationship from transmission spectrum. The wavelength dependence of refractive index was fitted to Cauchy dispersion relationship and the data accorded with Cauchy dispersion relationship very well. Thickness of the film was determined and by comparing the relative standard deviation, we found it could make the result more accurate by fitting the data of refractive index to Cauchy dispersion relationship.
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