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 …

The history and current status of the Keldysh theory of strong field ionization are reviewed.
The focus is on the fundamentals of the theory, its most important applications and those …

The quantitative rescattering theory (QRS) for high-order harmonic generation (HHG) by
intense laser pulses is presented. According to the QRS, HHG spectra can be expressed as …

Photoelectron holography constitutes a powerful tool for the ultrafast imaging of matter, as it
combines high electron currents with subfemtosecond resolution, and gives information …

Neutral H2 formation via intramolecular hydrogen migration in hydrocarbon molecules plays
a vital role in many chemical and biological processes. Here, employing cold target recoil …

The ionization probability of N 2, O 2, and CO 2 in intense laser fields is studied theoretically
as a function of the alignment angle by solving the time-dependent Schrödinger equation …

The time delay of photoelectron emission serves as a fundamental building block to
understand the ultrafast electron emission dynamics in strong-field physics. Here, we study …

A numerical approach that allows for the solution of the time-dependent Schrödinger
equation (TDSE) describing molecules exposed to intense short laser pulses was …

The strong-field approximation for ionization of diatomic molecules by an intense laser field
is generalized to include rescattering of the ionized electron off the various centers of its …

Laser-induced tunneling ionization is one of the fundamental light-matter interaction
processes. An accurate description of the tunnel-ionized electron wave packet is central to …