Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Scanning probe microscopy: light matter interaction at atomic scales – Poster

O 43.8: Poster

Dienstag, 10. März 2026, 14:00–16:00, P2

Sub-10-fs compression of NIR pulses for phase-resolved sampling of MIR lightwave transients — •Justus Heß, Ugaitz Elu, Andrea Rossetti, Martin Wolf, and Melanie Müller — Department of Physical Chemistry, Fritz Haber Institute, 14195 Berlin, Germany

Lightwave scanning tunneling microscopy (LW-STM) employs single-cycle THz pulses as femtosecond bias [1], enabling imaging at sub-nanometer spatial and sub-picosecond temporal resolution. Ultrashort phase-stable mid-infrared (MIR) pulses promise to increase the time resolution in LW-STM. Phase-resolved characterization of the incident and STM tip-enhanced MIR transients requires sampling pulses with a duration of ideally less than 10 fs. For future MIR excitation in our LW-STM, we implement a MIR source and a pulse-compression scheme based on supercontinuum generation in a photonic crystal fiber (PCF) at 2 MHz in our existing LW-STM setup. Near-infrared (NIR) pulses with a duration of ~40 fs at a center wavelength of 1030 nm are spectrally broadened via self-phase modulation in the PCF to a Fourier-limit of 6 fs. Subsequent dispersion control with a transmission-grating compressor yields few-cycle pulses at 30mW average power sufficient for MIR waveform sampling in LW-STM. [1] T. Cocker et al., Nature 539, 263*267 (2016)

Keywords: Scanning-Tunneling Microscope; Lightwave STM; Ultrafast Pulse Compression