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Lasing efficiency and photochemical stability of laser dyes spanning the infrared spectral region 710-950 nm

concentration of Rhodamine B (with the optical arrangement used). Experiments were also carried out on several pairs of dye mixtures, including  Dichlorofluorescein as donor and Rhodamine B and DODC as acceptors, and using the 488.0 nanometer output of an argon ion laser to excite the donor alone. The results showed that excitation transfer rates were related (i) to the overlap of absorption and emission spectra of the acceptor and donor dyes respectively and (ii) to the dye concentration. The efficiency of excitation transfer, as measured by the total fluorescent quantum yield for the mixture, over the quantum yield for the donor dye alone was found to be -90% for single step transfer. This was the case for several of the dyes tested, including those used for three color laser operation. The high efficiency of the energy transfer processes makes the use of dye mixtures attractive for a variety of applications including three color lasers for display purposes, and for increasing the efficiency of flashlamp pumped dye laser systems by utilizing more effectively the wide spectral output of the pump bands.