Abstract
We observed that increasing the clusters size and laser pulse contrast can enhance the X-ray flux emitted by femtosecond-laser-driven-cluster plasma. By focusing a high contrast laser (10(-10)) on large argon clusters, high flux Kα-like X-rays (around 2.96 keV) is generated with a total flux of 2.5 × 10(11) photons/J in 4π and a conversion efficiency of 1.2 × 10-4. In the case of large Kr clusters, the best total flux for L-shell X-rays is 5.3 × 1011 photons/J with a conversion efficiency of 1.3 × 10-4 and, for the Kα X-ray (12.7 keV), it is 8 × 10(8) photons/J with a conversion efficiency of 1.6 × 10-6. Using this X-ray source, a single-shot high-performance X-ray imaging is demonstrated.
Highlights
During the past few decades, it was demonstrated that laser-produced plasmas are very bright, pointed, short-duration X-ray sources that emit in the energy range of 0.1 to 10 keV, depending on the lasers and targets used
Comparisons of Ar gas density spatial distribution measured by interferometry and the spatial distribution of cluster sizes measured by light scattering diagnostics have demonstrated the predictive capability of this code
It is interesting to compare the previous measurements of K-shell X-ray emission from Ar clusters with our results
Summary
During the past few decades, it was demonstrated (see, for example [1,2]) that laser-produced plasmas are very bright, pointed, short-duration X-ray sources that emit in the energy range of 0.1 to 10 keV, depending on the lasers and targets used. These unique properties of laserproduced plasmas with essentially low cost and table-top size compared with synchrotronbased X-ray sources allow efficient application for high-spatial-resolution, contact, or phasecontrast imaging of different samples in a large field of view. Speaking, such approach gives the possibility to create a very bright and debris-free X-rays
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