Adiabatic population transfer in effective three-level systems driven by laser beams
Adiabatic　population　transfer　in　effective　three-level　systems　driven　by　laser　beams

The population transfer in effective three-state systems driven by laser beams has been studied based on the theory of Lewis－Riesenfeld Hermitian invariants in the full- and partial-adiabatic approximations. A strict formulation of adiabatic conditions is given, and a new adiabatic condition for inducing a complete population transfer is found.