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Laser Physics 2 (1992) 704-710
Two photon laser spectroscopy of transition ions in crystals: interconfigurational transitions
M. Daoud1, M. Kibler1

Symmetry adaptation techniques are applied to the determination of the intensity of two-photon absorption transitions, between Stark levels of configurations with opposite parities, for transition ions in finite symmetry environments. The equivalence between third-order mechanisms and second- plus first-order mechanisms is clearly established. A compact formula is derived for the intensity of a two-photon transition between two levels with well-defined symmetries. A set of (selection) rules which controls the number of intensity parameters for inter-configurational transitions is given. The formalism is illustrated with the case of an ion with 4f configuration in tetragonal symmetry.
1 :  IPNL - Institut de Physique Nucléaire de Lyon
Physique/Physique/Agrégats Moléculaires et Atomiques

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