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Cumulative electronic non-linearity of CdSe/ZnS quantum dots

A Gaussian beam of a continuous wave laser, while propagating through an absorbing medium, may transform into a set of conical beams. Earlier, such a transformation was believed to be only due to thermal non-linearity. Our experimental data, however, led us to the conclusion that the transformation of the Gaussian beam occurs because of both thermal and electronic non-linearities. The cumulative character of electronic non-linearity is provided by parting of light-induced charge carriers.