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Observation of self-focusing of light mediated by cubic nonlinearities in potassium titanyl phosphate

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Abstract

We report our observations of the transient self-narrowing of light beams mediated by dominant Kerr nonlinearities and two-photon absorption in a bulk potassium titanyl phosphate crystal near conditions for second-harmonic generation. Drastic differences between upconversion and downconversion processes are highlighted.

© 2002 Optical Society of America

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