Abstract
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.
Original language | English |
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Pages (from-to) | 9248-9253 |
Number of pages | 6 |
Journal | Optics Express |
Volume | 15 |
Issue number | 15 |
DOIs | |
State | Published - 23 Jul 2007 |
Externally published | Yes |