Abstract

Some characteristics of selected laser dyes are reviewed, and the effect of heterocyclic atom substitutions on triplet (π, π*) transitions is studied experimentally. Specifically, the intensities (oscillator strengths f) of the lowest-energy singlet–singlet (S–S) and triplet–triplet (T–T) transitions of anthracene and some of its heterocyclic analogs were measured. It is shown that this type of substitution of carbon atoms by heteroatoms results in a considerable reduction of intensity of T–T transitions. This observation is important to laser dye technology. The effect is explained by the existence of an efficient vibronic coupling mechanism between (n, π*) and (π, π*) triplet states in heteroatom molecules. Some general guidelines for how to find efficient laser dyes are proposed.

© 1997 Optical Society of America

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