Speaker
Description
The advent of attosecond pulses, produced through high-order harmonic generation (HHG) in the beginning of the millennium, has opened up for time domain spectroscopic approaches with unprecedented, attosecond, time resolution. However, typical attosecond sources are often impaired by the low repetition rate of the driving lasers, potentially resulting in measurements with insufficient statistics and low signal-to-noise ratio. This is particularly true for experiments where several reaction products must be detected in coincidence and for applications where space charge effects compromise spatial and spectral resolution.
In this talk, I will discuss the development of a high-repetition rate (200 kHz) attosecond source and its first applications in attosecond pump-probe interferometry. Key to our approach is the combination of a well-controlled, high repetition rate, CEP-stable, few-cycle laser source with a specially designed gas target for efficient harmonic generation and a homemade 3D coincidence photoelectron/ion momentum detector. While the most established techniques in the field of attosecond science either use single attosecond pulses or long trains of pulses, we explore the hitherto mostly overlooked intermediate regime of short trains, i.e. with only a few pulses. We present a proof-of-principle measurement of one-photon double-ionization in He with full angular resolution, achieving detection rates comparable to synchrotron facilities. We have set the conditions for future studies of highly correlated many-body processes in the temporal domain.
