Experimental and numerical study of ultra-short laser-produced collimated Cu <i>K</i><sub>α</sub> X-ray source

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<jats:title>Abstract</jats:title><jats:p><jats:italic>K</jats:italic><jats:sub>α</jats:sub> X-ray sources generated from the interaction of ultra-short laser pulses with solids are compact and low-cost source of ultra-short quasi-monochromatic X-rays compared with synchrotron radiation source. Development of collimated ultra-short <jats:italic>K</jats:italic><jats:sub>α</jats:sub> X-ray source by the interaction of 45 fs Ti:sapphire laser pulse with Cu wire target is presented in this paper. A study of the <jats:italic>K</jats:italic><jats:sub>α</jats:sub> source with laser parameters such as energy and pulse duration was carried out. The observed <jats:italic>K</jats:italic><jats:sub>α</jats:sub> X-ray photon flux was ~2.7 × 10<jats:sup>8</jats:sup> photons/shot at the laser intensity of ~2.8 × 10<jats:sup>17</jats:sup> W cm<jats:sup>−2</jats:sup>. A model was developed to analyze the observed results. The <jats:italic>K</jats:italic><jats:sub>α</jats:sub> radiation was coupled to a polycapillary collimator to generate a collimated low divergence (0.8 mrad) X-ray beam. Such sources are useful for time-resolved X-ray diffraction and imaging studies.</jats:p>

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