Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 25: Interaction with strong or short laser pulses II
A 25.5: Vortrag
Mittwoch, 2. März 2016, 15:45–16:00, f107
Non-instantaneous nonlinear optical response in tailored dielectric media — •Chanteau Bruno1, Jusko Chirstoph1, Nagy Tamas1,2, Tajalli Ayhan1, Willemsen Thomas3, Jupé Marco3, Ristau Detlev3, and Morgner Uwe1 — 1Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, D-30167 Hannover, Germany — 2Laser-Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany — 3Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany
Nowadays it is common to generate sub-10 fs pulses. When dealing with such short pulses, the third-order electronic polarization decay time, usually neglected because expected to be in the fs-range, becomes relevant for third-order nonlinear optical processes.
We investigate this non-instantaneous electronic polarization in the case of amorphous dielectrics. Since the decay time depends on the difference between the resonance frequency of the medium, i.e. optical bandgap, and the laser frequency, we use as non-linear medium ternary oxydes layers, in which, through the ratio of the oxydes, we can tune the bandgap.
The measurements are performed with a THG D-scan setup, with 6-fs TiSa femtosecond laser, on ScO2/SiO2 samples. The thickness of the samples is below 100 nm, in order to avoid any propagation effects. The different behavior of the polarizations of these samples, whose bandgaps range within 5.5 to 7 eV (compared to the third harmonic beam of 4.8 eV), will be shown.