Effect of the proton phototransfer reaction on the laser radiation of heteroaryloxazoles

Excited state proton transfer dye lasers

“…At higher acetic acid concentrations, the laser radiation of the photoreaction product appears and the efficiency of this radiation increases with the increase in the acid concentration. 116 Both the neutral and the protonated forms of 2-heteryloxazoles cause additional losses, which decrease stimulated emission by the corresponding conjugated acid-base form. For this reason, it is impossible to produce two-band laser radiation in solutions of 2-heteryloxazoles.…”

“…The losses due to the cations in the lasing by the neutral forms, in addition to S n /S 1 absorption in the region of stimulated emission of the neutral forms, may result from slow dissociation of the cations in the ground state. 116 2. Light absorption by decay products of a lasing species.…”