lonization–recombination mechanism of growth of the losses due to triplet–triplet absorption in vapor dye lasers

Internal losses in vapor dye lasers are attributed to preferential formation of triplet-state molecules as a result of the volume recombination of electrons and cations formed by multistage photoionization of active molecules under the action of the pump radiation. Calculations for a longitudinal pumping variant are used to show that this loss mechanism causes a severe deterioration in the lasing energy characteristics of vapor dye lasers compared with liquid dye lasers.