Abstract

The two-photon absorption resonance that is due to the internal charge-transfer transition of an organic push–pull molecule has been characterized. A nonlinear absorption spectrum of the 4-(diethylamino)-$\beta$-nitrostyrene molecule was measured in a tetrahydrofuran solution by optical Kerr ellipsometry. The shape and the amplitude of the two-photon absorption spectrum are well described by a model that uses the relevant one-photon absorption spectrum related to the internal charge-transfer transition.

© 1997 Optical Society of America

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