| Abstract
| - In this paper, we develop a new strategy for designing organic molecules exhibiting at the same time a strongtwo-photon absorption and a good transparency in the visible region: the oligomeric strategy. At the presenttime, these two properties are hardly simultaneously fulfilled only by a few existing organic molecules. Thisapproach does not involve any charge transfer and then contrasts with the donor−acceptor strategy. The one-and two-photon absorption properties of 9,9-dihexylfluorene oligomers are first presented and then analyzedthanks to a simple three-level excitonic coupling model. This model, which succeeds in reproducing theexperimental data, is then used as a prospective tool, and a set of simple rules is extracted for improving theoptical properties of this family of molecules.
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