Attosecond pulses are generated by a macroscopic number of ionizing atoms interacting
with a focused laser pulse, via the process of high harmonic generation. The physics of their …

High-harmonic generation provides an attractive light source of coherent radiation in the
extreme-ultraviolet (XUV) and soft-x-ray regions of the spectrum and allows for the …

Experiments on the sub-femtosecond time scale performed in recent years and their
theoretical background are reviewed in this article. We present the essentials of the …

High-order harmonic generation from atoms ionized by femtosecond laser pulses has been
a promising approach for the development of coherent short-wavelength sources. However …

Recent demonstrations of high-harmonic generation (HHG) at very high repetition
frequencies (∼ 100 MHz) may allow for the revolutionary transfer of frequency combs to the …

Single-atom high-order harmonic generation is considered in the strong-field approximation,
as formulated in the Lewenstein model, and analyzed in terms of quantum orbits. Orbits are …

Publisher Summary This chapter provides an overview on various scattering and reaction
processes taking place in a powerful laser field. These processes can be either laser …

We show that attosecond pulse trains have a natural application in the control of strong field
processes. In combination with an intense infrared laser field, the pulse train can be used to …

We show that noncollinear high harmonic generation (HHG) can be fully understood in
terms of nonlinear optical wave mixing. We demonstrate this by superposing on the …

We study the phase of the atomic polarization in the process of high-order harmonic
generation. Its dependence on the laser intensity and the harmonic order induce a …