Abstract

The Kramers–Heisenberg matrix element for two-photon transitions between a bound (n, l, m) state and a continuum is obtained in terms of the Coulomb Green’s function matrix element for the ground-state ↔ continuum transition. The number of the F₁ Appell functions involved is minimized. The analytical results for the ns ↔ continuum transitions are given, and both the resonant behavior and the transparency region of the two-photon cross section are predicted.

© 1986 Optical Society of America

Two-photon absorption of atomic hydrogen from two light beams

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