Contribution of the components of a binary solution to stimulated emission due to flashlamp excitation

A study was made of the contribution of electronic excitation energy transfer processes and the gain factor to the stimulated emission from various ethanol solutions of rhodamine and oxazine dyes due to flashlamp excitation. A method is proposed for calculation of the power density of the radiation absorbed by the acceptor molecules taking into account energy transfer from the donor to the acceptor and overlap of their gain spectra. Estimates are also made of the direct contribution of the excited donor molecules to the stimulated emission flux in the acceptor band. The calculated values are compared with the relative change in the output power of the mixture due to the introduction of a donor component into the active solution.