Planar slabs of pure Sn and Li were irradiated with 1064 nm, 9 ns Nd:YAG laser pulses. The resulting plasmas were
evaluated with an absolutely calibrated extreme ultraviolet (EUV) power tool, a transmission grating spectrograph, a
pinhole camera, and a Faraday cup. These diagnostic tools have allowed us to determine EUV conversion efficiency
(CE), EUV spectral emission features, EUV-emitting plasma size, and the kinetic energies and fluxes of ions at various
laser intensities for both Sn and Li plasmas. The maximum estimated CE values for Li and Sn plasmas are 1 ± 0.1 % and
2 ± 0.2 %, respectively. The Li2+ Lyman-α line and Sn8-13+ lines generate the in-band emissions of Li and Sn. The
intensity of Li2+ lines was found to increase with laser intensity. However, the Sn unresolved transmission array (UTA)
showed remarkable changes with at higher laser intensities, including the appearance of a spectral dip. EUV plasma
images showed that Sn plasmas take on a conical shape, as opposed to the hemispherical shape of Li plasmas. Ion debris
analysis showed the kinetic energies for Li ions are less than that of Sn ions under similar conditions. Moreover, the
kinetic spread of Li ions has been found to be narrower compared to the kinetic energy distribution of the Sn ions. We
also compared the ion flux emitted by Sn and Li plasmas.
We investigated the angular dependence of atomic and ionic debris from CO2 and YAG laser-produced tin
plasmas. Several diagnostic techniques were employed for this study including a Faraday cup, witness
plates and subsequent x-ray photoelectron spectroscopic analysis, optical emission spectroscopy etc. It was
found that the debris emission from the Nd:YAG laser-produced plasmas fell sharply from the target
normal. In contrast, the debris emission from the CO2 laser-produced plasmas was almost constant at short
angles from the target normal. Our results also indicated that the plasma produced by the CO2 laser emitted
less atomic and ionic debris compared to a plasma produced by Nd:YAG laser.
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