CHARACTERISTICS OF PICOSECOND EMISSION FR OM A DISTRIBUTED-FEEDBACK LASER WITH A BINARY MIXTURE OF DYES SUBJECTED TO NANOSECOND EXCITATION

An investigation was made of the generation of picosecond pulses in a distributed-feedback (DFB) laser with a binary mixture of dyes excited by nanosecond pulses. In contrast to a one-component solution, the du ration and energy of the output pulses emitted by the binary mixture d ecreased at the short-wavelength edge of the tuning range, which was d ue to the absorption of the laser radiation by acceptor molecules. An investigation of the polarisation and kinetics of the radiation emitte d by the DFB laser showed that the radiative and nonradiative transfer of the excitation energy in the binary dye mixture had different effe cts on the generation of picosecond pulses, which led to the appearanc e of two independent trains of ultrashort light pulses or of single pu lses.