Limiting length of lasers utilizing complex organic compounds in the case of reabsorption of stimulated radiation by unexcited and excited singlet molecules

Analytic estimates are obtained of the radiation parameters of lasers utilizing complex organic compounds. An allowance is made for the influence of reabsorption of stimulated radiation by unexcited and excited singlet molecules. It is shown that reabsorption limits the laser radiation power. A comparison is made between the stimulated emission efficiencies of laser oscillators and amplifiers. Equations are derived to estimate the limiting length of oscillators and amplifiers. Dimensionless parameters, which determine the possibility of scaling up laser systems utilizing complex organic molecules, are obtained. Examples of calculations of the radiation parameters of lasers utilizing POPOP vapor and a rhodamine 6G solution are presented.