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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.17: Poster
Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof
Third harmonic generation in thin film layers — •David Zuber1,2, Holger Badorreck2,3, Morten Steinecke3, Marco Jupe2,3, and Uwe Morgner1,2,3 — 1Institute of Quantum Optics, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 2Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering Innovation AcrossDisciplines), Hannover, Germany — 3Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany
Cascaded third harmonic generation (THG) of NIR lasers is a state of the art technique for the generation of ultrashort pulses in the UV spectral region. This approach suffers from several obstacles, mainly the high complexity and phasematching restraints. For many applications, both problems can be circumvented by using direct THG from thin films. THG from thin films is known to be strongly dependent on the thickness of the layer. Here, these thickness dependence is experimentally studied by measuring the backward and forward direction THG from thin layers on top of a substrate. The samples were specially manufactured as gradient layers with continuosly varying thickness ranging from a few nanometers to a few micrometers. The results are compared to simulations with and without internal interference effects to determine regimes, where those effects have to be included to predict the THG correctly. The results will be used to estimate the χ (3) value of the layers materials. Furthermore, the influence of the substrate and the surrounding medium on the THG will be studied by using different substrate materials and surrounding gasses.