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HL: Fachverband Halbleiterphysik

HL 23: Ultra-fast phenomena

HL 23.8: Vortrag

Dienstag, 17. März 2020, 11:45–12:00, POT 112

Photoelectron spectroscopy combining an ultrashort infrared field with an attosecond pulse pair — •Jan Vogelsang, Sara Mikaelsson, Chen Guo, Cord L. Arnold, Mathieu Gisselbrecht, Anders Mikkelsen, and Anne L'Huillier — Department of Physics, Lund University, 221 00 Lund, Sweden

We perform photoelectron spectroscopy in helium gas and at a zinc oxide (ZnO) surface using two attosecond pulses with a fixed delay and a 7-fs short infrared laser pulse. The experiments are enabled by a 200-kHz repetition rate OPCPA laser system, generating pairs of attosecond pulses in a high pressure gas jet. The measured photoelectron kinetic energy spectra are strongly modulated due to the interference of the electron matter waves emitted by the pair of attosecond pulses, showing the well-known odd-order harmonics. Additionally, the infrared dressing field leads to a periodic modulation of the spectra when we change the temporal delay, very much like in an attosecond streaking experiment, but with the spectral resolution of the harmonic frequency comb.