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HL: Fachverband Halbleiterphysik
HL 20: Optical Properties
HL 20.4: Vortrag
Dienstag, 2. April 2019, 14:45–15:00, H31
Nonlinear white-light generation driven by far infrared light in the broad region from 20 μm to 240 μm — •Nils W. Rosemann1,2, Florian Dobener2, Robin C. Döring2, Eike Dornsiepen3, Stefanie Dehnen3, and Sangam Chatterjee2 — 1Division of Chemical Physics, Department of Chemistry, Lund University, Sweden — 2Institute of Experimental Physics I, Justus-Liebig-Universität Giessen, D-35392 Giessen, Germany — 3Faculty of Chemistry and Materials Sciences Center, Philipps-Universität Marburg, D-35043 Marburg, Germany
The far infrared response of an amorphous cluster compound which exhibits highly nonlinear optical properties is presented. The extreme nonlinearity enables white-light generation using excitation wavelengths in the range from 20 μm to 240 μm. The emitted light is found to cover a range from the visible to mid-infrared region. Additionally, changes of the emission characteristics for pump energies close to vibrational resonance of the cluster compound are explored. The results support prior developed model that assigns the white-light generation to the anharmonic movement of electrons in the clusters ground state potential and excludes simple photon upconversion.