Abstract
We present a study of laser-induced optical inhomogeneity and associated nonlinear phenomena in a liquid suspension. The investigated medium consists of nonlinear dielectric particles (refractive index, np = n0p + n2pZ) suspended in a linear liquid (refractive index n01) with n0p = n01, where / is the incident irradiance. When / is low, the medium is transparent. When / is high, a mismatch An = n2pl is induced between the particles and the liquid, which leads to scattering of the laser beam and low transmission. Moreover, the nonlinearity of the particles causes an irradiance- dependent phase change of the laser beam, which leads to self-focusing or defocusing of the beam. With a proper lens and aperture system outside the liquid cell, the transmission can be further reduced (from the occurring through scattering loss alone) by taking advantage of the self-refraction.
© 1986 Optical Society of America
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