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.
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| http://dx.doi.org/10.1364/ol.27.002016 | DOI Listing |
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