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

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....

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Bibliographic Details
Published in:Applied sciences 2021-08, Vol.11 (15), p.6919
Main Authors: Masnavi, Majid, Richardson, Martin
Format: Article
Language:English
Subjects:
Broadband
collisional-radiative model
Dense plasmas
Electron energy
far-ultraviolet spectroscopy
Fiber optics
Fluid dynamics
Fluid flow
Fluid mechanics
Hydrodynamics
Laser applications
Laser plasmas
laser-produced plasma
Lasers
Light sources
Noise
Plasma
plasma light source
Plasmas (physics)
Radiation
radiation-hydrodynamics
Seya–Namioka monochromator
Ultraviolet radiation
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11156919