Detailed space-resolved characterization of a laser-plasma soft-x-ray source at 13.5-nm wavelength with tin and its oxides

Choi, IW Daido, H Yamagami, S Nagai, K Norimatsu, T Takabe, H

Iw. Choi et al., Detailed space-resolved characterization of a laser-plasma soft-x-ray source at 13.5-nm wavelength with tin and its oxides, J OPT SOC B, 17(9), 2000, pp. 1616-1625

32

INGLESE

Article

Apllied Physucs/Condensed Matter/Materiales Science","Optics & Acoustics

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS

0740-3224 → ACNP

17

9

2000

1616 - 1625

ISI

0740-3224(200009)17:9<1616:DSCOAL>2.0.ZU;2-I

Space-resolved soft-x-ray spectra of laser-produced plasmas of pure-Sn meta l and its oxides were measured in the spectral range 7-23 nm. We establishe d a comprehensive spectroscopic database of the emission characteristics of the transition array of highly ionized Sn near 13.5-nm wavelength by varyi ng the incident laser energy and the angle between the observation axis and the target normal. We examined the narrow spectral bandwidth of the transi tion array obtained by use of a gas-mixed fine-particle (SnO2 powder) targe t proposed by Matsui et al. [Proc. SPIE 3886, 610 (2000)]. We selected pure -Sn metal, SnO and SnO2 powder, and SnO2 thin-film targets with which to cl arify the roles of additional constituent ions, such as O and Ar, in plasma s of the gas-mixed fine-particle targets. The space-resolved spectra show t hat the bandwidth of the transition ar Pay broadens dramatically and that t he wavelength at peak intensity shifts slightly toward longer wavelengths w ith increasing distance from the original target surface or with decreasing incident laser energy. The origins of the broadening and the wavelength sh ift can be explained in terms of an increase in the range of ion stages tha t contribute to the transition array and in terms of transfer of the domina nt ion stages to lower stages. The narrow bandwidth of the gas-mixed line-p article target is probably due to the presence of a narrow range of moderat e ion stages. (C) 2000 Optical Society of America [S0740-3224(00)01609-X].