Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 22: Posters: Quantum Optics and Photonics II

Q 22.13: Poster

Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof

Near-field phase diagnostics of intense ultrashort laser pulses — •Sergej Poplavski, Bastian Hagmeister, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

Intense ultrashort laser pulses with pulse durations in the 10 fs regime have gained increasing relevance in experimental physics and accomplished applicability in many different fields; from a mere diagnostics tool over time resolution in ultrashort physics to next generation particle accelerators. Yet even small aberrations cause large uncertainties of the spatial and temporal intensity in the focal region of ultrashort laser pulses. Hence the precise knowledge of the pulse shape is of utmost importance for reproducible and reliable experiments.

Since diagnostics in the focus is impractical and often even unfeasible, we present an indirect approach to focus diagnostics: The field is characterized with respect to its amplitude and phase in the near-field with spectral and spatial resolution, allowing a conclusion onto the pulse's properties in the focus. We compare methods for retrieving the required data and discuss the calibration procedure and the reliability of the transformation from the near-field to the far-field.