Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 73: Quantum Sensing: Applications & Spectroscopy
FM 73.5: Talk
Donnerstag, 26. September 2019, 15:00–15:15, Aula
Attosecond Time Delays in Photoionisation of Noble Gas Atoms — •Matteo Moioli1, Hamed Ahmadi1,2, Fabio Frassetto3, Luca Poletto3, Francesca Bragheri4, Roberto Osellame4, Cristian Manzoni4, Giulio Cerullo2, Claus Dieter Schröter5, Robert Moshammer5, Thomas Pfeifer5, and Giuseppe Sansone1 — 1Physikalisches Institut, Universität Freiburg, Freiburg, Germany — 2Dipartimento di Fisica, Politecnico, Milano, Italy — 3Istituto di Fotonica e Nanotecnologie, CNR, Padova, Italy — 4Istituto di Fotonica e Nanotecnologie, CNR, Milano, Italy — 5Max-Planck-Institut für Kernphysik, Heidelberg, Germany
Here, we present the preliminary results of the investigation of ultrafast dynamics in photoionisation in noble gas atoms. We also illustrate the scheme of an Optical Parametric Amplifier (OPA) setup for the generation of pulses with a stable Carrier-Envelope-Phase (CEP). In particular, using coincidence photoelectron-photoion spectroscopy, the correlated dynamics between photoelectron(s) and photoion(s) can be explored. In the experiment we investigated attosecond time delays in photoionisation using trains of attosecond pulses and a synchronized infrared (IR) pulse. The measured photoionisation time delays can be resolved in terms of emission angle and energy of the photoelectron. In order to maintain a reproducible electric field of the IR pulse, we generate passively CEP-stable pulses through Difference Frequency Generation (DFG) and then amplify them in an OPA setup. The broad amplification bandwidth of the OPA enables generating few-optical cycle pulses.