14 April 2000 Dye-triplet-state and singlet-oxygen quenching effects in solid state dye lasers
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Proceedings Volume 3929, Solid State Lasers IX; (2000) https://doi.org/10.1117/12.382759
Event: Symposium on High-Power Lasers and Applications, 2000, San Jose, CA, United States
The main photodegradation mechanisms of pyrromethene 567 are discussed, and the quantum efficiency of self-sensitized photo-oxidation, the predominant mechanism, was found to be 0.5% in aerated benzene-d6. Other degradation mechanisms do exist, but the high photostability of the dye in solid host media possibly implies that they are all diffusion controlled. Solid-state dye lasers based on pyrromethene 567 doped poly(methyl methacrylate) with an added singlet oxygen quencher 1,4-diazobicyclo [2,2,2] octane showed a lifetime of 550,000 pulses. A triplet quencher, perylene, provided no improvement. Singlet oxygen quenching is effective in the solid-state whereas triplet quenching is not, presumably due to the slower diffusion rate of dye molecules compared with oxygen.
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Terence A. King, Mohammad Ahmad, Anthony Gorman, I. Hamblett, Mark D. Rahn, "Dye-triplet-state and singlet-oxygen quenching effects in solid state dye lasers", Proc. SPIE 3929, Solid State Lasers IX, (14 April 2000); doi: 10.1117/12.382759; https://doi.org/10.1117/12.382759

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