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14 October 1997 Cluster effects in soft x-ray pulse generation from femtosecond-laser-produced plasma on a metal-doped glass target
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Abstract
The soft x-ray emission from plasma on a gold-doped glass target produced by a 130-fs Ti:sapphire laser pulse was studied at a laser intensity range of 1015 - 1016 W/cm2. To evaluate the effects of gold clusters in glass, we compared gold-doped glass with different gold cluster sizes while keeping the gold densities the same (approximately 0.001 vol%). We found that larger gold clusters led to an increase in soft x-ray emission integrated in the range from 5 to 20 nm. Integrated soft x- ray emission from a gold-doped glass target reached about 50% of that from a 1-micrometers thick gold film target. The gold clusters in glass enhanced the soft x-ray emissions about four times compared with a host glass which contained no gold clusters. The pulse durations of soft x-rays emitted from gold-doped glass targets were measured to be 4 - 7 ps, which were slightly shorter than those from a gold target. Due to the low metal density and high plasma formation threshold, particulate deposition, which is a serious obstacle in applying laser-produced plasma x-rays to practical use, was greatly reduced by the use of a gold- doped glass target. From these points of view, femtosecond laser-produced plasma x-ray emitted from metal-doped glass show promise as an ultrafast soft x-ray source.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hidetoshi Nakano, Tadashi Nishikawa, and Naoshi Uesugi "Cluster effects in soft x-ray pulse generation from femtosecond-laser-produced plasma on a metal-doped glass target", Proc. SPIE 3157, Applications of X Rays Generated from Lasers and Other Bright Sources, (14 October 1997); doi: 10.1117/12.279421; https://doi.org/10.1117/12.279421
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