Introduction to the intuitive engineering of homogeneous and isotropic two-photon absorbent molecular materials

摘要

In this paper,we give practical instructions for linking explicitly the macroscopic two-photon absorption properties of any homogeneous and isotropic molecular material with the microscopic quantum structures of the corresponding molecules.This article is dedicated to a wide public.It is also separated from any consideration around the structural optimization of two-photon absorbers.The previously mentioned link is clearly established and the limitations of the corresponding mathematical expressions are underlined.These general expressions are then applied to the particular case of the three-level approximation,which is extensively used at the moment for the intuitive engineering of two-photon absorbers.