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Measuring lifetime and magnitude of the optical Kerr-effect in tailored bandgap materials

Subject Area Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas
Term from 2012 to 2023
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 211196355
 
Final Report Year 2021

Final Report Abstract

The major work items of the subproject were dedicated to the preparation and characterization of coatings with extremely large thickness beyond values of 100 µm. In order to achieve this target on the technical level, the deposition system had been extended by an improved substrate rotation concept in combination with a substrate heating unit, and the corresponding characterization techniques for layer thickness, optical losses as well as the non-linear refractive index were adapted. In different coating materials of the ternary oxide compounds AlxSiyOz NbxAlyOz, and HfxAlyOz, layers with thicknesses up to 182 µm with reduced internal stress and low optical losses could be produced. The nonlinear properties of these novel materials have been investigated on the basis of an interferometric measurement of the wave front curvature from the intensity-induced Kerr lens as well as by generating the third harmonic (THG). By analyzing the THG in thin wedged layer structures, a novel method for measuring the nonlinear susceptibility was proposed and demonstrated.

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