SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Magnetic Instrumentation and Characterization
MA 48.2: Vortrag
Freitag, 31. März 2023, 09:45–10:00, HSZ 401
A signal-integrating approach to second harmonic generation imaging and spectroscopy — Lea Forster1, •Jan Gerrit Horstmann1, Jannis Lehmann1,2, Thomas Lottermoser1, and Manfred Fiebig1 — 1Dept. of Materials, ETH Zurich, Switzerland — 2RIKEN Center for Emergent Matter Science (CEMS), Japan
We investigate the impact of different data normalization procedures on the signal-to-noise ratio in second harmonic generation (SHG) imaging and spectroscopy. Using both nanosecond and femtosecond laser systems in combination with standard detection schemes for SHG, we find that uncorrelated noise in the detection electronics often dominates over the contributions of pulse-to-pulse fluctuations of the laser system, long-term power drifts, or time-dependent changes of the beam profile. Consequently, normalization of SHG signals averaged over thousands of pulses can yield similar signal-to-noise ratios comparable with pulse-to-pulse-normalized data. Based on these results, we demonstrate that state-of-the-art CCD or sCMOS cameras can, in many cases, replace photomultiplier tubes as detectors in pump-probe SHG measurements, enabling ultrafast high-resolution SHG imaging of nonequilibrium dynamics in solids.