Abstract
We present a new theory of very-high-or- der harmonic generation (HHG) in a two- level atom based on Bloch equations for the density matrix (with relaxation) of a periodically driven atom. These equations result in an infinite number of iterative coupled equations for the Fourier components of neighboring odd harmonics of polarization, which are easily solved numerically. Our results are qualitatively consistent with those of other, much more complicated models as well as with experimental data and other two-level models solved numerically; in particular, they show formation of a so-called plateau in HHG. Most significantly, we developed an approximate technique that allowed us to analytically evaluate most important characteristics of the phenomenon; in particular, we have derived for the first time, to our knowledge, an amazingly simple analytic formula for the cutoff frequency of the plateau (see our paper at the oralpresentation section).
© 1993 Optical Society of America
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