Abstract
Coherent XUV radiation is generated from a high-pressure helium jet irradiated by 5-fs pulses at 0.8 μm. Below the ionization potential the spectrum exhibits well resolved odd and also even harmonics, turning into a continuum at shorter wavelengths. At a pulse energy of 0.3 mJ the continuum extends to the K-edge of carbon.
© 1997 Optical Society of America
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