Enhancement of the dye laser efficiency by utilization of electron energy transfer processes

An analysis is reported of the influence of electron energy transfer on the lasing efficiency of flashlamp-pumped dye solutions. Different transfer processes are considered, including those involving introduction of an acceptor dye, energy donors, and triplet quenching agents into solutions, the use of luminescent optical filters in the pump system, and the contribution of excited donor molecules to lasing within an acceptor band. It is shown that the calculated and experimental values of the increase in the lasing efficiency are close for a number of multicomponent active media emitting in the visible part of the spectrum. Mixed solutions are proposed for increasing the efficiency of a coumarin-314 laser ($\bar{\lambda_L}$ = 510 nm) by a factor of 1.8. In the case of unsubstituted and B rhodamines ($\bar{\lambda_L}$ = 560 and 610 nm) the simultaneous influence of donors, triplet quenching agents, and luminescent optical niters can, under optimal conditions, increase the efficiency by a factor of 30 so that these dyes approach the lasing efficiency of rhodamine 6Zh.