Quantitative analysis of vacuum-ultraviolet radiation from nanosecond laser-zinc interaction

•VUV spectra from 10 to 60 ns laser-produced zinc plasmas are investigated.•Conversion efficiency in the wavelength region of 124–164 nm are measured.•Double and triple ionized zinc radiate strongly over the VUV region. The paper reports measurements of the vacuum-ultraviolet spectral irradiances of...

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Bibliographic Details
Published in:Optics and laser technology 2018-07, Vol.103, p.1-7
Main Authors: Parchamy, Homaira, Szilagyi, John, Masnavi, Majid, Richardson, Martin
Format: Article
Language:English
Subjects:
Atomic structure
Broadband
Computational fluid dynamics
Fluid flow
Fluid mechanics
Hydrodynamics
Laser-matter interaction
Laser-produced plasma
Lasers
Local thermodynamic equilibrium
Non-local thermodynamic equilibrium population kinetics
Quantitative analysis
Radiation-hydrodynamics
Seya-Namioka monochromator
Ultraviolet radiation
Ultraviolet spectra
Vacuum-ultraviolet spectroscopy
Zinc
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Summary:•VUV spectra from 10 to 60 ns laser-produced zinc plasmas are investigated.•Conversion efficiency in the wavelength region of 124–164 nm are measured.•Double and triple ionized zinc radiate strongly over the VUV region. The paper reports measurements of the vacuum-ultraviolet spectral irradiances of a flat zinc target over a wavelength region of 124–164 nm generated by 10 and 60 ns duration low-intensities, 5×109-3×1010 W cm−2, 1.06 μm wavelength laser pulses. Maximum radiation conversion efficiencies of 2.5%/2πsr and 0.8%/2πsr were measured for 60 and 10 ns laser pulses at the intensities of 5×109 and 1.4×1010 W cm−2, respectively. Atomic structure calculations using a relativistic configuration-interaction, flexible atomic code and a developed non-local thermodynamic equilibrium population kinetics model in comparison to the experimental spectra detected by the Seya-Namioka type monochromator reveal the strong broadband experimental emission originates mainly from 3d94p-3d94s, 3d94d-3d94p and 3d84p-3d84s, 3d84d-3d84p unresolved-transition arrays of double and triple ionized zinc, respectively. Two-dimensional radiation-hydrodynamics code is used to investigate time-space plasma evolution and spectral radiation of a 10 ns full-width-at-half-maximum Gaussian laser pulse-zinc interaction.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2018.01.006