Energy transfer and laser action in binary solutions excited by short and ultrashort pulses

An analysis is made of the relative contributions of radiative and nonradiative dipole-dipole energy transfer from donors to acceptors during laser action in binary solutions of polyatomic molecules excited by nanosecond and picosecond pump pulses. A study is reported of systems with overlapping donor luminescence and acceptor absorption spectra, where both donor and acceptor are capable of stimulated emission. Spectral-polarization methods are used to show that the radiative energy transfer mechanism predominates in the investigated systems.