Spectroscopic Studies of Laser-Based Far-Ultraviolet Plasma Light Source

Abstract

A series of experiments is described which were conducted to measure the absolute spectral irradiances of laser plasmas created from metal targets over the wavelength region of 123–164 nm by two separate 1.0 μm lasers, i.e., using 100 Hz, 10 ns, 2–20 kHz, 60–100 ns full-width-at-half-maximum pulses. A maximum radiation conversion efficiency of ≈ 3%/2πsr is measured over a wavelength region from ≈ 125 to 160 nm. A developed collisional-radiative solver and radiation-hydrodynamics simulations in comparison to the spectra detected by the Seya–Namioka-type monochromator reveal the strong broadband experimental radiations which mainly originate from bound–bound transitions of low-ionized charges superimposed on a strong continuum from a dense plasma with an electron temperature of less than 10 eV.

Laser-Driven Accelerators, Radiations, and Their Applications

“…A review of the recent developments, limitations, and perspectives of multi-GeV electron accelerators with PW-class lasers using the laser-wakefield acceleration approach is provided [3]. Advanced spectroscopic investigations of laser-based, far-ultraviolet plasma sources are also presented [4]. Recent progress in the design and development of automated systems to refresh solid targets at a high repetition rate during the interaction with high-intensity laser pulses are presented, along with ion diagnostics and corresponding data collection and real-time analysis methods [5].…”