Laser-threshold calculations for lasing of acidbase species in proton-transfer media.

An estimate of laser thresholds for both the acid and the base species of dyes undergoing proton-transfer reactions is given. It is seen how the excited-state kinetic constants and proton concentration affect the laser threshold of each species. Calculations of laser threshold for simultaneous lasing of both species are also carried out. The latter is applied to the simultaneous lasing of neutral and acid forms of the 4-Amino-1,7-dimethylpyrido[2,3-c]-1,2,6-thiadiazine 2,2-dioxide in acetonitrile and corroborates the experimental results.