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A: Fachverband Atomphysik
A 21: Ultrafast Dynamics II (joint session MO/A)
A 21.4: Vortrag
Donnerstag, 9. März 2023, 11:45–12:00, F102
High-order spectroscopy at 100 kHz repetition rate — •Katja Mayershofer1, Simon Büttner1, Tim Schembri2,3, Matthias Stolte2,3, Frank Würthner2,3, and Tobias Brixner1,3 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — 2Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — 3Center for Nanosystems Chemistry (CNC), Universität Würzburg, Theodor-Boveri-Weg, 97074 Würzburg
With our new laser setup we can carry out shot-to-shot femtosecond spectroscopy experiments at 100 kHz repetition rate, which decreases the measurement time to a few seconds for conventional coherent two-dimensional spectroscopy experiments. For the shot-to-shot measurements an acousto-optical modulator pulse shaper was implemented, which can arbitrarily shape pulses at 100 kHz repetition rate, and we detect full spectra with a line camera at 100 kHz. The increase in repetiton rate and the ability to measure shot-to-shot also leads to a better signal-to noise ratio as a larger number of averages can be measured in the same time frame as previous measurements. As an examplary measurement, we show data taken using the new development of fifth-order transient absorption spectroscopy. This method can be used to analyze the exciton dynamics in J-type coupled merocyanine dye films, which are interesting in view of their optoelectronic properties.[1]
[1] A. Liess, et al., Adv. Funct. Mater. 2019, 29, 1805058.