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In the focal region the field strength of current lasers may be comparable to, or even greater than, the atomic field strength. Transitions involving absorption or emission of many field quanta can occur in these circumstances and perturbation theory becomes inadequate to describe the laser-plasma interaction. However, the laser frequency is in general much less than the atomic frequency. It is, therefore, possible to retain the classical description of the electromagnetic field. This paper first treats multiphoton excitation and ionisation with a simple atomic model and then multiphoton ionisation of a complex, high-Z atom, arguing for a modified Thomas-Fermi description.

Additional information

Authors: OBERMAN C, Princeton Plasma Physics Laboratory, Princeton, New Jersey (US)
Bibliographic Reference: Report: LRP 424/90 EN (1990) 58 pp.
Availability: Available from Confédération Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, 21 avenue des Bains, 1007 Lausanne (CH)
Record Number: 199110575 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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