PNNL

Abstract

This letter reports dual frequency comb spectroscopy in the deep ultraviolet used to characterize transient laserproduced plasmas. Dual-comb spectroscopy at these wavelengths enables access to a large number of strong electronic transitions in neutral and ionized atoms and molecules. This broadband dual-frequency comb system at 265 nm measures multiple transitions in neutral and singly-ionized iron atoms in a laser-produced plasma. Analysis of absorption spectra yields time-resolved ion and neutral column densities, excitation temperatures, and electron densities which are measured down to 1014 cm-3 levels. The results provide new insights into low-temperature plasma properties.