Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 31: Poster II

MA 31.14: Poster

Wednesday, March 19, 2025, 17:00–19:30, P1

Integration of a dual broadband characterization setup for time-resolved magneto-optical spectroscopy — •Richard Leven, Sophie Bork, David Gutnikov, Umut Parlak, and Mirko Cinchetti — Department of Physics, TU Dortmund, 44227 Dortmund, Germany

We present a recently developed setup for broadband ultrafast magneto-optical pump-probe spectroscopy, optimized for operation at low temperatures and high magnetic fields. The setup utilizes a broadband supercontinuum (white light) probe beam, spanning wavelengths from the near UV to the near IR region. Two independent CMOS detector arrays enable simultaneous data acquisition across all available wavelengths, providing comprehensive insights into transient reflectivity (Δ R/R) and polarization rotation (Δ θ) measurements in a single experiment. The system operates at variable repetition rates, ranging from <10 kHz to ∼100 Hz, combining the precision of a femtosecond laser source with high sensitivity for low-light conditions. To validate the setup, we conduct experiments on the semiconducting antiferromagnet CrSBr, ensuring the spectrum encompasses the material’s bandgap and exciton excitation energies. This poster will detail the technical specifications of the setup, its characterization results, and its performance benchmarks, highlighting its potential for studying ultrafast dynamics in a variety of magnetically ordered systems.

Keywords: Spectroscopy; Magneto-Optics; Broadband