Triplet extinction coefficients of some laser dyes I

Abstract

We measured the triplet extinction coefficients εT over the laser action spectral region of Rhodamine 6G; Rhodamine B; Rhodamine 110; Fluorol-7GA; Coumarin 540A; Coumarin 522; Coumarin 1; Coumarin 120; 4,4′-diphenyl stilbene; and 2,7-bis-(4-methoxy-phenyl)-9,9-dipropylfluorene. We employed the different lines from an argon ion cw laser for excitation. McClure’s method was used to obtain the triplet extinction coefficients εT. The method requires the measurement of triplet optical densities ODT as a function of different cw laser excitation intensities (powers) Iex . The importance of triplet-state losses on dye laser efficiency is reviewed. The laser action properties of the laser dyes we studied are briefly discussed as they relate to the measured εT values.