Extreme ultraviolet emission from dense plasmas generated with sub-10-fs laser pulses

TL;DR

This study investigates the extreme ultraviolet emission from dense plasmas created by sub-10-fs laser pulses, revealing high-density plasma features and validating spectral models through simulations.

Contribution

It provides new insights into high-density plasma emission spectra generated with ultra-short laser pulses and combines experimental data with comprehensive computer simulations.

Findings

Observation of a series limit indicating high-density plasma conditions.

Reproduction of spectral features through hydrodynamic and collisional radiative simulations.

Detection of K and L shell spectra from various target materials.

Abstract

The extreme ultraviolet (XUV) emission from dense plasmas generated with sub-10-fs laser pulses with varying peak intensities up to 3*10^16 W/cm^2 is investigated for different target materials. K shell spectra are obtained from low Z targets (carbon and boron nitride). In the spectra a series limit for the hydrogen and helium like resonance lines is observed indicating that the plasma is at high density and pressure ionization has removed the higher levels. In addition, L shell spectra from titanium targets were obtained. Basic features of the K and L shell spectra are reproduced with computer simulations. The calculations include hydrodynamic simulation of the plasma expansion and collisional radiative calculations of the XUV emission.