Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Poster Tuesday: Plasmonics and Nanooptics

O 46.7: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Femtosecond pulse compression for nonlinear spectroscopy — •Johannes Klier, Christoph Schnupfhagn, Julian Obermeier, and Markus Lippitz — Experimentalphysik III, University of Bayreuth, Germany

A pulse shaper makes it possible to manipulate arbitrarily the phase and amplitude of a femtosecond laser pulse. This is very useful for nonlinear spectroscopy since electric fields for multi-photon processes can be generated very accurately. Therefore, it is important that the pulse does not experience any broadening in time domain when coupled into a high-NA microscope. This compensation of the pulse chirp can be done with different nonlinear processes. Two photon absorbtion or the FWM-signal of samples with a large third-order nonlinear susceptibility χ⁽³⁾ in combination with phase-resolved interferometric spectral modulation (PRISM) are well suited for achieving this task. Here we present our experimental setup and results on pulse compression in the focal plane. Moreover, we give an overview how multi-photon excitation of dyes and graphene can be implemented in future experiments.