High Intensity Effects in Multiphoton Free-Free Transitions

Abstract

In this report we present a number of theoretical results concerning the multiphoton free-free transitions (MFFT), in which the intensity of the radiation field is found to play a key role. The emphasis is on high values of the field intensity because, as it is now largely known, in the theory of MFFT the field may be included exactly. Thus the theoretical treatment of MFFT opens the possibility of investigating in rigorous way high-intensity effects, and the related information may prove useful for the more general context of atomic physics driven by intense, nonresonant lasers. This remarkable peculiarity of the MFFT theory extends to include also the treatment of the statistical properties of the radiation, and has already provided new and unexpected information (see, for instance, refs. 1 and 2).