The nonlinear optical response of gold particles (with 2.5, 9, or 15 nm radius) prepared by γ-radiolysis in
water solution and stabilized by poly(vinyl alcohol) is size-dependent. The 2.5 nm clusters do not limit light
transmission even at very high fluence of nanosecond laser pulses, while the larger clusters strongly limit the
laser beam transmission at 530 nm. The threshold of limitation and the amplitude depend on the size of the
particles. The rise of the optical limiting effect is measured by picosecond laser spectroscopy. For the largest
particles, it lasts 1 ns. The limitation effect is attributed to large light-scattering centers induced by the pulse
around the initial particles.
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