Ratio of radiative to nonradiative energy transfer in lasing systems

An estimate is obtained of the contributions of radiative and nonradiative energy transfer processes in rhodamine 6G–oxazine 17, rhodamine 6G–cresyl violet, and rhodamine S–oxazine 17 systems subjected to laser excitation in the absence of donor Iasing. A study is made of the dependences of the rate constants of radiative and nonradiative energy transfer processes on the acceptor concentration. Theoretical estimates are supported by experimental dependences of the degree of polarization of the donor luminescence on the acceptor concentration.