Monitoring Atomic Cluster Expansion by High-Harmonic Generation

Monitoring atomic cluster expansion by high-harmonic generation.

High-harmonic generation is shown to be capable of providing time-resolved information about the particle density of a complex system. As an example, we study numerically high-harmonic generation from expanding xenon clusters in a pump-probe laser scheme, where the pump laser pulse induces the cluster explosion and the probe pulse generates harmonics in the expanding cluster. We show that the h...

Atomic photoionization experiment by harmonic-generation spectroscopy

Spin-Orbit Effects in Atomic High-Harmonic Generation

Spin-orbit interactions lead to small energy gaps between the outer-most p1/2 and p3/2 shells of noble gas atoms. Strong-field pulses tunnel-ionize an electron out of either shell resulting in spinorbit-driven hole motion. These hole dynamics affect the HHG yield. However, the spectral shape as well as the angular distribution of the HHG emission is not influenced by spin-orbit coupling. We dem...

Intensity-dependent atomic-phase effects in high-order harmonic generation.

The far-field angular distributions of high-order harmonics of a 1054-nm laser, with orders ranging from the lower teens to the upper thirties, have been measured in thin, low-density Ar, Kr, and Xe targets. The 1.25times-diffraction-limited, 1.4-ps-duration, Gaussian laser pulses were focused to intensities ranging from 3 X 10' to 3 X 10' W/cm, using f/70 optics. A gas target localized the gas...

Atomic-like high-harmonic generation from two-dimensional materials

The generation of high-order harmonics from atomic and molecular gases enables the production of high-energy photons and ultrashort isolated pulses. Obtaining efficiently similar photon energy from solid-state systems could lead, for instance, to more compact extreme ultraviolet and soft x-ray sources. We demonstrate from ab initio simulations that it is possible to generate high-order harmonic...