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Fluorophosphate glasses doped with PbSe quantum dots and their nonlinear optical characteristics

Melekhin, V. G. and Kolobkova, E. V. and Lipovskii, A. A. and Petrikov, V. D. and Malyarevich, A. M. and Savitski, Vasili (2008) Fluorophosphate glasses doped with PbSe quantum dots and their nonlinear optical characteristics. Glass Physics and Chemistry, 34 (4). pp. 351-355. ISSN 1087-6596

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A new fluorophosphate glass matrix containing PbSe quantum dots characterized by a narrow size distribution (Delta R/R similar to 5-7%, where R is the size of a quantum dot) is prepared under heat treatment. It is demonstrated that fluorophosphate glasses can be doped by introducing (ZnSe + PbO) or PbSe into the composition of the glass. The optical absorption spectra of the quantum dots corresponding to the strong quantum confinement regime are studied over a wide range of quantum-dot sizes (4-18 nm). The nonlinear optical absorption is investigated at a wavelength of 1.54 mu m. It is revealed that the introduction of (ZnSe + PbO) rather than of PbSe into the composition of the glass improves the bleaching contrast owing to a more uniform distribution of the quantum dots over the volume of the glass sample.