We present a review of work that has been done during the last 10 years on atomic
scattering and reaction processes in bichromatic laser fields. Of particular interest will be the …

The roles of energy, momentum and orbital angular momentum conservation in high-
harmonic generation were studied in the past. Here, we explore the role of spin angular …

Circularly-polarized extreme ultraviolet and X-ray radiation is useful for analysing the
structural, electronic and magnetic properties of materials. To date, such radiation has only …

We generate angularly isolated beams of circularly polarized extreme ultraviolet light
through the first implementation of non-collinear high harmonic generation with circularly …

Optical interactions are governed by both spin and angular momentum conservation laws,
which serve as a tool for controlling light–matter interactions or elucidating electron …

We demonstrate, to our knowledge, the first bright circularly polarized high-harmonic beams
in the soft X-ray region of the electromagnetic spectrum, and use them to implement X-ray …

Abstract The word'attosecond'(1 as= 10− 18 s) officially entered the vocabulary of physics
when sub-femtosecond pulses of UV/XUV light produced either by nonlinear frequency …

Symmetry is one of the most generic and useful concepts in science, often leading to
conservation laws and selection rules. Here we formulate a general group theory for …

Highly efficient high-harmonic generation was achieved in helium using a two-color laser
field that consisted of the fundamental and the second harmonic fields of a femtosecond Ti …

We theoretically demonstrate the possibility to generate both trains and isolated attosecond
pulses with high ellipticity in a practical experimental setup. The scheme uses circularly …