Abstract
Over the past several years our efforts have been directed toward a systematic investigation of nonlinear properties of a new series of polyme- thine dyes (PDs) and squarylium dyes (SDs) in liquid solutions and polymeric media.1,2 These studies led to the development of several new dyes showing strong excited-state absorption (ESA) in the visible region with the ratios of ex- cited-to ground-state absorption cross-sections up to 200 at 532 nm. One of these dye’s (labeled PD2338) chemical structure is shown in Fig. la along with its singlet energy level diagram Fig. lb. The study of the excited state transition moments will lead to a deeper understanding of the nature of ESA in organic molecules and will aid in the quantum-chemical calculations for the prediction of their nonlinear properties.
© 2002 Optical Society of America
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