Mainz 2026 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: Ultrafast Electronic Dynamics

MO 5.3: Talk

Monday, March 2, 2026, 17:45–18:00, P 204

Low dispersion, phase-modulated rapid-scanning interferometry in the deep UV spectral region — •Felix Selz, Ulrich Bangert, Fabian Richter, Felix Riedel, Nils-Oliver Schütz, and Lukas Bruder — Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany

Stable interferometer schemes for the deep UV spectral region and ultrashort pulse applications remain limited. Conventional spectrometers typically lack the required phase stability, whereas common-path interferometers introduce substantial temporal dispersion. We have recently developed a low-dispersion interferometric approach that combines high phase stability with excellent sensitivity using an efficient rapid scanning lock-in detection scheme [1]. We are now extending this scheme into the deep UV spectral region with particular emphasis on minimizing material dispersion to ensure compatibility with sub 10-fs laser pulses. This opens up Fourier transform and coherent multidimensional spectroscopy with high temporal and spectral resolution in the deep UV domain.

[1] F. Richter et al., Opt. Lett. 50, 3668-3671 (2025)

Keywords: Femtosecond spectroscopy; Advanced spectroscopy techniques; Rapid scanning; Phase modulation; UV spectroscopy