Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.22: Poster

Donnerstag, 8. September 2022, 16:00–18:00, P4

Integration of a supercontinuum probe line in a setup for time-resolved magneto-optical spectroscopy — •Sophie Bork, Richard Leven, Marc Terschanski, Fabian Mertens, Umut Parlak, and Mirko Cinchetti — Department of Physics, TU Dortmund University, Otto-Hahn-Straße 4, 44227 Dortmund, Germany

We have recently developed a setup for wide spectral range ultrafast pump-probe magneto-optical spectroscopy at low temperature, high-magnetic and electric fields [1]. Here we present an upgrade of this setup that allows to measure the transient reflectivity (ΔR/R) in a broad spectral range and with femtosecond time-resolution. To this end, we have generated a broadband supercontinuum (white light) probe beam that covers the wavelengths from the near UV to the near IR region. The detection of the white light spectrum reflected or transmitted from the sample is achieved by a 1D-array of CMOS detectors that allow for simultaneous data acquisition of all available wavelengths. This upgraded setup can work at high repetition rates (< 100 kHz) and allows to perform measurements with high temporal and spectral resolution. This is particularly useful, for example, to fully map the photo-driven transient evolution of the band gap energy in magnetically ordered semiconducting systems and to assess whether it is linked to the magnetization dynamics [2]. In this poster contribution we will present all technical details of the setup together with first characterization measurements to specify its performance.

[1] Mertens et al., Rev. Sci. Instrum. 91, 113001 (2020)

[2] Bossini et al., Phys. Rev. B 104, 224424 (2021)