Second-harmonic generation in metal oxide/ormosils nanocomposites derived from sol-gel processing

摘要

Abstract: Nanocomposites of Ormosis containing metal oxides, such as niobates, titanates and zirconates, were prepared by sol-gel processing. The materials were hydrolyzed partially and were dried in air atmosphere for appropriate periods. Afterwards, the materials were heat-treated between 200$DGR and 450$DGR@C for 2 days in pure oxygen. The final bulk samples are transparent in infrared and visible ranges. X-ray diffraction patterns showed that these samples did not have any crystalline phases after heating up to 200$DGR@C. Using a Nd:YAG laser of 1.064 $mu@m wavelength, second harmonic generation, of green light (0.532 $mu@m), was observed in these metal oxides/Ormosils nanocomposites. The refractive index and other optical properties of the metal oxides/Ormosils were also measured. The microstructures of these samples were examined by transmission electron microscopy.!15