Soft X-ray spectral analysis of laser produced molybdenum plasmas using the fundamental and second harmonics of a Nd:YAG laser

Lokasani, Ragava; Kawasaki, Hiromu; Shimada, Yuta; Motomizu, Shoji; Anraku, Kyoya; Ejima, Takeo; Hatano, Tadashi; Jiang, Weihua; Namba, Shinichi; Nikl, Jan; Zeman, Michal; O’Sullivan, Gerry; Higashiguchi, Takeshi; Limpouch, J.

doi:10.1364/oe.27.033351

Cited by 2 publications

(1 citation statement)

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“…Previously, the experimental and theoretical spectra of highly charged zirconium ions in plasmas have been investigated, and its continuous spectral radiation in the water window band was found to be contributed by 3d-4p and 3d-4f transitions according to atomic calculations. Recently, the characteristics of unresolved transition arrays (UTA) in laserproduced molybdenum [22][23][24] plasmas were well-analyzed, and their potential as a water window source has been highlighted. Once again, the main emission of the plasmas in the water window soft x-ray spectral region was mainly due to resonant 3d-4p and 3d-4f and their satellite transitions.…”

Section: Introductionmentioning

confidence: 99%

A study on soft x-ray spectra from pulsed 1 μm Nd:YAG laser-induced ytterbium plasmas

Wu¹,

He²,

Yang³

et al. 2020

Plasma Sci. Technol.

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The Nd:YAG laser with a wavelength of 1.064 μm was used to generate plasmas on a high-purity solid ytterbium ( 70 Yb) target in a vacuum chamber. The soft x-ray time-and space-integration spectra from the Yb plasmas were measured in the wavelength range of 1.0-8.5 nm under different power densities. The atomic spectral data of the unresolved transition arrays from highly charged Yb ions were calculated based on Cowan's suite of codes, including configuration interaction. The calculated Gaussian envelope of the emission determined by the weighted spontaneous transition rates was compared with the experimental spectra, and a good agreement between them was obtained. The spatial-temporal evolutions of the plasmas under the experimental conditions are simulated based on the collisional-radiative model, enabling the understanding of the mechanism of the plasma conditions for optimal water window waveband emission output.

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Section: Introductionmentioning

confidence: 99%