First Measurement of the Non-instantaneous Response Time of a χ(3) Nonlinear Optical Effect
1 Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin, Germany
2 Optoelectronics Research Centre, 33101 Tampere, Finland
3 Laser Zentrum Hannover, 30419 Hannover, Germany
4 Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany
The third harmonic of a few-cycle pulse, generated at different dielectric surfaces, is investigated using interferometric frequency-resolved optical gating. We present direct experimental evidence for a non-instantaneous nonlinear response in a TiO2 thin film whereas surface third-harmonic generation in a SiO2 sample does not show any indication for non-instanteneity. To the best of our knowledge, this constitutes the first report of a non-instantaneous nonlinear optical response of a dielectric optical material.
© Owned by the authors, published by EDP Sciences, 2013
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