SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 70: Poster: Plasmonics and Nanooptics II

O 70.1: Poster

Mittwoch, 29. März 2023, 18:00–20:00, P2/EG

Phase correction and stability of a Mach-Zehnder interferometer for 2D electronic spectroscopy — •Simon Durst, Sanchayeeta Jana, Christoph Schnupfhagn, and Markus Lippitz — University of Bayreuth

Fluorescence detected 2D electronic spectroscopy (F-2DES) allows the measurement of ultrafast electron dynamics in complex systems, while disentangling this spectral information from energetically similar phenomena, such as molecular vibration.

The technique requires an excitation signal of four time-delayed laser pulses, which we create via a four-arm Mach-Zehnder interferometer. This interferometer receives a single pulse as an input, and, through the use of delay stages and acusto-optical modulators, outputs a desired pulse train with frequency-modulated phase profiles, used for lock-in detection.

When exciting a sample with this pulse train, special attention must be given to the phase relation between the individual pulses. A mismatch or instability in their spectral phase leads to an excitation with pulses of different lengths or unknown delays and will overall worsen the performance of the setup.

Therefore, this poster highlights the techniques and instruments we use to characterize and compensate the relative phase between the different interferometer arms: GVD correction using a spatial light modulator, a prism compressor setup and interferometric delay scans.