This paper has been prepared by the Symphony collaboration (University of Warsaw,
Uniwersytet Jagielloński, DESY/CNR and ICFO) on the occasion of the 25th anniversary of …

When intense light interacts with an atomic gas, recollision between an ionizing electron and
its parent ion creates high-order harmonics of the fundamental laser frequency. This sub …

This tutorial presents an introduction to the interaction of light and matter on the attosecond
timescale. Our aim is to detail the theoretical description of ultra-short time delays and to …

High harmonic generation (HHG) in atomic and molecular gases builds the foundation of
attosecond science. In recent experiments HHG has been demonstrated in solids for the first …

There have been several experimental reports showing high-order harmonic generation
from solids, but there has been no unifying theory presented as of yet for all these …

We experimentally demonstrate that atomic orbital parity mix interferences can be temporally
controlled on an attosecond time scale. Electron wave packets are formed by ionizing argon …

Improving the brightness of high-harmonic generation (HHG) sources is one of the major
goals for next-generation ultrafast, imaging and metrology applications in the extreme …

The ground-state vibrational wave packet produced by strong-field ionization of Br 2 is
characterized by femtosecond high-harmonic transient absorption spectroscopy. Vibrational …

We show that the divergence of extreme ultraviolet pulses from high-harmonic generation,
which is directly linked to the shape and size of the refocused beam, can be controlled by …

We experimentally and theoretically study high-order harmonic generation in zinc oxide
crystals irradiated by mid-infrared lasers. The trajectories are mapped to the far field spatial …