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Intense High-Contrast Femtosecond<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-Shell X-Ray Source from Laser-Driven Ar Clusters
Bright Ar quasimonochromatic $K$-shell x ray with very little background has been generated using an Ar clustering gas jet target irradiated with a 30 fs ultrahigh-contrast laser, with a measured flux of $2.2\ifmmode\times\else\texttimes\fi{}{10}^{11}\text{ }\text{ }\mathrm{\text{photons}}/\mathrm{J}$ into $4\ensuremath{\pi}$. This intense x-ray source critically depends on the laser contrast and intensity. The …