Abstract

At present, however, such solutions are not being widely used due to their low photostability. It is obvious that elucidation of dye photodecomposition mechanisms would be helpful in solving the photostability problem. At present, the knowledge of these processes is extremely scarce including even phenomenological data on various factors (concentration, spectral composition, excitation intensity, etc.) that affect photostability. Moreover, studies on the photoconversion of laser dyes in solutions have been conducted mainly with the steady-state monochromaticexcitation by cw spectral lamps or lasers [5, 6] and the obtained data cannot be used in interpreting results typical for the broad-band irradiation by pulsed lamps in laser illuminators.

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