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In this work, we show that reversible photodegradation of Disperse Orange 11doped in PMMA is not due to dye diffusion - a common phenomenon observed inmany dye-doped polymers. The change in linear absorbance due tophotodegradation of the material shows an isobestic point, which is consistentwith the formation of a quasi-stable damaged species. Spatially-resolvedamplified spontaneous emission and fluorescence, both related to the populationdensity, are measured by scanning the pump beam over a burn mark. A numericalmodel of the time evolution of the population density due to diffusion isinconsistent with the experimental data suggesting that diffusion is notresponsible.

Testing the diffusion hypothesis as a mechanism of self-healing in Disperse orange 11 doped in PMMA