Suppression of superluminescence in a dye Dfb-laser with a dynamic grating

Abstract

We propose a theoretical model which describes the dynamics of a dye laser with light-induced distributed feedback and takes into account both the radiation at the lasing frequency and the superluminescence developed in the amplification band. We show the possibility of suppressing the superluminescence and enhancing the contrast of radiation generated at a frequency distant from the amplification-line center to the luminescent background by using a mixture of dyes with active and absorbing centers. It has been established that this method is most effective in the case where pump pulses shorter than the relaxation time of active-medium inversion are used.