In this work, we show that reversible photodegradation of Disperse Orange 11 doped in poly(methyl methacrylate) is not due to dye diffusion—a common phenomenon observed in many dye-doped polymers. The change in linear absorbance due to photodegradation of the material shows an isobestic point, which is consistent with the formation of a quasi-stable damaged species. Spatially resolved amplified spontaneous emission and fluorescence, both related to the population density, are measured by scanning the pump beam over a burn mark. A numerical model of the time evolution of the population density due to diffusion is inconsistent with the experimental data, suggesting that diffusion is not responsible.
© 2011 Optical Society of America
Original Manuscript: June 13, 2011
Manuscript Accepted: August 9, 2011
Published: September 12, 2011
Shiva K. Ramini, Nathan Dawson, and Mark G. Kuzyk, "Testing the diffusion hypothesis as a mechanism of self-healing in Disperse Orange 11 doped in poly(methyl methacrylate)," J. Opt. Soc. Am. B 28, 2408-2412 (2011)