We report on the mixed network effect of broadband near-infrared (NIR) emission of Bi-doped borogermanate glasses. On excitation with 808 nm laser diode (LD) radiation, the fluorescence emission intensity at 1235 nm with a full width at half maximum (FWHM) of about 200 nm was found to vary with B 2 O 3 content, which agrees well with the variation tendency of the absorption intensity at 500 and 700 nm. The peak position and the intensity of the NIR emission depend strongly on the excitation wavelength. Two kinds of bismuth centers are proposed to coexist in the Bi-doped borogermanate glasses: Bi 0 and Bi + , which contribute to the NIR emissions at 1240 and 1095 nm, respectively.

ABSTRACT:We investigated the third-order nonlinear optical properties of donor-acceptor substituted hydrazones doped into PMMA matrix using single beam Z-scan technique at 532 nm. The magnitude of third-order susceptibility, v (3) is of the order of 10 À13esu. The nonlinear refractive index, n 2 and the molecular second order hyperpolarisability, c h are of the order of 10 À11 esu and 10 À32 esu, respectively. The compounds exhibit larger third-order NLO properties in PMMA host when compared to the pure compounds. The study reveals that these hydrazones are a good candidate of nonlinear optical materials for photonic applications.

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