Abstract
We present first principles calculations of parametric amplification of attosec-ond coherent pulses around 100 eV at the single-atom level in high order harmonic generation from excited states of He+ and compare them with experimental measurements. Our results indicate the basic physics to achieve the desired attosecond XUV gain in the spectral regions far from the ionization threshold of the considered interacting media.
© 2020 The Author(s)
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