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Q: Fachverband Quantenoptik und Photonik
Q 26: Poster – Ultrashort Pulses and Strong Fields (joint session K/Q)
Q 26.6: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Towards All-Optical Attoclock Measurements in Noble Gases Using Short-Wave Infrared Laser Pulses — •Fridolin Geesmann1, Morten Drees2, David Zuber1,3, Ihar Babushkin1,3,4, and Uwe Morgner1,3 — 1Leibniz University Hannover, Institute of Quantum Optics, Hannover, Germany — 2University of Ottawa, Ottawa, Canada — 3Cluster of Excellence PhoenixD, Hannover, Germany — 4Max Born Institute, Berlin, Germany
Laser driven ionization of noble gases gives rise to a plethora of interesting effects, such as the so-called Brunel radiation, which originates from the ionization and subsequent acceleration of electrons in the strong optical electric field. The study of this radiation, in particular of its polarization state, allows for detailed insights into the fundamental principles of light-matter interaction. Here, we report on the usage of elliptically polarized short-wave infrared femtosecond laser pulses generated by a home-built optical parametric amplifier to drive the generation of Brunel harmonics in Argon, which then encode information about the tunnel time of the electrons through the Coulomb barrier of the gas atoms in the rotation of their polarization ellipse. Our setup facilitates ultrashort laser pulses centered around 2 µm that exhibit pulse energies of up to 110 µJ and pulse durations below 40 fs. Furthermore, it allows for the simultaneous measurement of the intensity-dependent polarization state of the third and fifth harmonic from the Brunel field, thus enabling an all-optical characterization of the tunnelling time of the matter under test.
Keywords: short-wave infrared; Brunel harmonics; light-matter interaction; OPA; tunnel time