Glass, optical applications compositions

In principle these compounds offer access to materials with AliCh-SiCL and Al203 2Si02 stoichiometries. The latter stoichiometry is equivalent to the Al[OSi(OBu-t)3 (OBu-t)] precursor. The major drawbacks with these materials are their air and moisture sensitivity, and the cost of the starting materials. Although the idealized stoichiometries of the above ceramics products are not those of crystalline aluminosilicates, amorphous aluminosilicate glasses are often important in optical applications or in scratch-resistant coatings. Furthermore, they may offer potential for CVD-type applications. There still remains considerable need for simple precursors to crystalline aluminosilicates, especially for structural applications. Dense, phase pure crystalline ceramic materials are desired for optimal mechanical properties, e.g. ceramic fibers for composite manufacture. 

Copper nanoparticles have been synthesized in silica by 50 keV Cu ion implantation with doses of 8.0x10 ion/cm. N anoparticles were c haracterized by absorption band of surface plasmon resonance in the visible range. Metal nanoparticle composite glasses were analyzed by the Z-scan method at the IR wavelength of NdiYAG laser radiation 1064 nm. The third order nonlinear susceptibility in the analyzed medium with simultaneous nonlinear refraction and absorption were considered as complex values. It is suggested that the samples with nonlinear absorption is perspective ones for optical applications. 

Parraud, S., Hubert-Pfalzgraf, L. G., and Floch, H., Stabilization and characterization of nanosize niobium and tantalum oxide sols. Optical applications for high power lasers, in Ultrastructure and Processing of Ceramics, Glasses and Composites, L. Hench (ed.), Wiley, New York, (1992). 

Most sulfide glasses for optical applications are based on the As-S and Ge-S systems, with compositions modified by other metal or non-metal sulfides. These glasses are IR-transmitting materials which can also be used as rare-earth ion hosts for optical amplifiers. 

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