Abstract
Optical limiting of the gold and silver nanocolloids has been studied under CW illumination at 532 nm. Nonlinear and thermo optical properties of the samples were investigated using CW Z-scan experiments. Sign of nonlinear refraction coefficient of colloids are negative at this condition. Negative sign implying thermal self defocusing is the most important mechanism of nonlinearity in our experiments. Diffraction pattern and greater magnitude of nonlinearities shows that gold nanocolloid is a better optical limiter than silver nanocolloid in the same experimental condition. Also thermo optical coefficient and limiting threshold of the samples have been determined.
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