Focusing of millijoule picosecond Kα radiation from 100 TW laser-solid interaction

Lévy, A.; Dorchies, F.; Audebert, P.; Chalupský, J.; Hájková, V.; Juha, L.; Kaempfer, T.; Sinn, H.; Uschmann, I.; Vysˇín, L.; Gaudin, J.
April 2010
Applied Physics Letters;4/12/2010, Vol. 96 Issue 15, p151114
Academic Journal
A calibrated x-ray spectrometer was used to characterize an intense 4.5 keV Kα source. Generated from the interaction of 30 J-320 fs laser pulses focused on 25 μm thick Ti foils, the conversion efficiency into Ti Kα line is estimated to (9±6)×10-5. Highly efficient collection, monochromatization and focusing were achieved using an ellipsoidally bent highly oriented pyrolytic graphite crystal. The measured 700 μm full width half maximum (FWHM) focal spot leads to a fluence of (3.0±2.1) mJ/cm2 hence paving the way to the study of intense x-ray pulse interaction with matter as demonstrated by a first simple experiment.


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