Exact description of self-focusing in highly nonlinear geometrical optics

Details Exact description of self-focusing in highly nonlinear geometrical optics Exact description of self-focusing in highly nonlinear geometrical optics

2008-01-14

arxiv.org/abs/0801.2035v1

Physics

Optics

3 figures

Scientific paper

We demonstrate that laser beam collapse in highly nonlinear media can be described, for a large number of experimental conditions, by the geometrical optics approximation within high accuracy. Taking into account this fact we succeed in constructing analytical solutions of the eikonal equation, which are exact on the beam axis and provide: i) a first-principles determination of the self-focusing position, thus replacing the widely used empirical Marburger formula, ii) a benchmark solution for numerical simulations, and iii) a tool for the experimental determination of the high-order nonlinear susceptibility. Successful comparison with several experiments is presented.

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