Abstract
Calculations of the two-photon ionization of metastable levels of helium and the first three s levels of cesium are presented. The calculations are carried out to second order in a perturbation expansion and are valid for low laser intensities. The behavior of the ionization cross section at high photon frequencies ω is studied, and it is found that the N-photon ionization cross section behaves as σ(N) ∝ ω−(2N+1/2). This analytic asymptotic behavior is verified numerically in the case of two-photon ionization.
© 1993 Optical Society of America
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