Abstract
Thermal defocusing effects in organic liquids containing dyes have been shown to be of interest for optical-limiting applications with nanosecond pulses,1 whereas in the picosecond regime they are not efficient. These thermal effects are due to a change in the refractive index, which can be a few orders of magnitude larger than that of CS2 in which a reorientational Kerr-like effect is induced, Nevertheless, when the build-up time of this nonlinearity is close to the pulse duration, the defocusing effect is significantly reduced (transient regime).
© 1995 Optical Society of America
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