Multiphoton processes between discrete states

Viktor A Kovarskii

A. M. Bonch-Bruevich, V. A. Khodovoǐ

Igor A. Ivanov, Anatoli S. Kheifets

We outline a formalism and develop a computational procedure to treat the process of multiphoton ionization (MPI) of atomic targets in strong laser fields. We treat the MPI process nonperturbatively as a decay phenomenon by solving a coupled set of the integral Lippmann-Schwinger equations. As basic building blocks of the theory, we use a complete set of field-free atomic states, discrete and continuous. This approach should enable us to provide both the total and differential cross sections of MPI of atoms with one and two electrons. As an illustration, we apply the proposed procedure to a simple model of MPI from a square-well potential and to the hydrogen atom.

Yves Gontier, M. Trahin

Multiphoton Raman-like transitions taking place above and below the ionization threshold of an atom can be useful for generating energetic photons of well-defined energies. In these processes, the atomic electron makes a bound-bound transition. It first absorbs N photons of the incoming light and then reemits a photon whose energy depends on N and on the discrete final state.

P. Lambropoulos, Stephen J. Smith

Muhammad Suhail Zubairy, M. S. K. Razmi, Saleem Iqbal +1 more