Abstract
The development of intense lasers has enabled optical fields to be produced which are sufficient to produce high harmonics of the fundamental frequency.[1] Above threshold ionisation (ATI) of the medium occurs at similar intensities and it is recognised that ATI and high harmonic generation are simply different aspects of the same interaction of the atom with the radiation field. 1–D calculations of the interaction indicate that the electron and photon spectra are similar in that they both exhibit a plateau region where the atomic response varies only slowly with the number of photons absorbed.[2]
© 1992 IQEC
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