Water-window soft X-ray harmonics up to ~450 eV are generated, with a kHz, multi-mJ mid-infrared optical parametric chirped-pulse amplifier (OPCPA) in a neon-filled gas cell. The photon flux at the nitrogen K-edge is ~1 × 106 photons/s/1% bandwidth.
© 2016 Optical Society of America
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Supplementary Material (1)