Hannover 2020 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 4: Poster

K 4.4: Poster

Dienstag, 10. März 2020, 16:30–18:30, f428

AOM shaper-based D-Scan in the mid-infrared region — •Florian Nicolai, Niklas Müller, and Tiago Buckup — Physikalisch-Chemisches Institut, Universität Heidelberg, 69120 Heidelberg, Germany

Pulse duration and phase characterization play a central role in ultrafast time-resolved spectroscopy. One method to determine the pulse’s spectral amplitude and phase is dispersion scan (d-scan). In this technique, a known amount of dispersion is added to the pulse and its effect on the second harmonic spectrum is observed. The d-scan method has already shown its success in the visible and near infrared spectral region. However, implementing a d-scan setup for mid infrared (MIR) pulses is quite challenging, especially due to the lack of suitable materials to imprint the desired amount of dispersion on the pulse. We show the successful realization of a d-scan setup for pulses in the MIR region at about 5.0 µm with an acousto-optic modulator (AOM). In this way we implemented a compact setup to determine the spectral phase of a MIR pulse. Furthermore, the AOM shaper has the potential to add an arbitrary phase and thus to compress the pulse.