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 …

In this tutorial we discuss the macroscopic aspects of the extreme nonlinear frequency
conversion process of high-order harmonic generation. For most, this entails describing the …

Symmetries and their associated selection rules are extremely useful in many fields of
science. For systems of electromagnetic (EM) fields interacting with matter, the symmetries of …

This work investigates the suppression of individual harmonics, simultaneously affecting
specific even and odd orders in the high-harmonic spectra generated by strongly tailored …

Phase matching in high-harmonic generation leads to enhancement of multiple harmonics. It
is sometimes desired to control the spectral structure within the phase-matched spectral …

We investigate the phase-matching of the high harmonics (HHG) driven by the circular Airy-
Gaussian beams (CAiGB), which abruptly auto-focus and subsequently propagate without …

Polarization beating quasi-phase-matching (PB QPM) in high-harmonic generation (HHG) is
currently understood as a purely-intensity-modulation quasi-phase-matching (QPM) …

A perturbing laser pulse modulates and controls the phase of the high harmonic radiation
driven by an intense fundamental pulse. Thus, a structured wave front can impress a specific …

We study high-order harmonic generation from atoms in bichromatic laser fields numerically
and analytically. With the weak increase of the second harmonic field, the calculated odd …

In this thesis an introduction was given to the theory of attosecond pulse synthesis by
highorder harmonic generation in gases. The advantages of the HHG technique in …