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VOLUME 33 (1981) | ISSUE 1 | PAGE 48
Nonlinear defocusing of a focused beam: a fine beam from the focus
This paper describes experiments on the focusing of a laser beam in a weakly absorbing nonlinear defocusing medium: a fine beam, which comes from the focus zone, is observed. Its formation dynamics are investigated as a function of time. The explanation of this effect in other experiments with a light spark in terms of light defocusing in the spark plasma is rejected. Simple explanations of these effects, such as the light defocusing in a spark plasma, are given.