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High brightness XUV sources in the 140-170 eV spectral range are of great demand as this spectral range covers important magnetic and molecular materials, such as the N-edge of Gadolinium and Terbium (145 and 155 eV) and L2,3 edge of sulphur [1]. High-order harmonic generation (HHG) allows performing ultrafast dynamics measurements with high temporal resolution in this spectral range because of extremely short, potentially sub-fs, temporal envelopes that are intrinsically synchronized to the near-IR driving laser pulses. We present HHG in the 170 eV range using 8.5 mJ post-compressed 20 fs 1.03 µm pulses from a 14 mJ Yb:CaF2 laser chirped pulse amplifier operating at 0.5 kHz repetition rate.
© 2017 IEEE
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