Resumen
We report a theoretical and experimental study on the real and imaginary part of the third-order nonlinear optical susceptibility at 532 nm and 7 ns pulse for high-purity silica samples containing Au nanoparticles prepared by ion implantation. We present a method for measuring the magnitude and sign of refractive and absorptive nonlinearities based on four-wave mixing (FWM). This method is derived from a comparison of the light intensities of incident and self-diffracted polarized waves. In the nanosecond regime the samples exhibit saturable absorption and it seems that a thermal effect is the mechanism responsible of nonlinearity of index.
Idioma original | Inglés |
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Páginas (desde-hasta) | 9248-9253 |
Número de páginas | 6 |
Publicación | Optics Express |
Volumen | 15 |
N.º | 15 |
DOI | |
Estado | Publicada - 23 jul. 2007 |
Publicado de forma externa | Sí |