Possibility of application of dyes, participating in photoprotolytic reactions, as simultaneous two-wavelength laser media at visible range was researched. Twenty-five dyes with proton accepting carbonyl group (derivatives of 7-aminocoumarin, anthrapyridone, benzanthrone, phenoxasinon) were studied. Spectral-luminescence characteristics of these dyes have been investigated at various hydrogen ion activities in ethanol. The dye structure influence on the efficiencies of various radiationless deactivation processes competing with photoprotolytic reactions, as well as on the increase of electron density on the excited oxygen atom of C $EQ O group were determined. Acid-base pairs, whose excitation energy losses, accompanying photoprotolytic reaction, don't exceed 30% and protolytic equilibrium shifts under excitation are maximal (pK$+*$/-pK$GRT@4.7) were selected. Laser spectra of selected acid-base pairs under the conditions of selective and broadband cavities have been investigated. Two- wavelength laser emission (TWLE) of some acid-base pairs was achieved at spectral region of 450-640 nm. Nonlinear dependence of long-wavelength laser intensity on pumping intensity was observed. On the basis of kinetic analysis it was shown that this nonlinear dependence is caused by competition of phototprotolytic reaction with laser emission of base form, as well as by acid-base forms interaction through laser fields. The influence of cavity parameters on the competition of two laser streams was examined. Optimal conditions for TWLE of acid-base pairs in cavity with beam splitter and two selective elements were determined.
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