Numerical simulation of ultrashort pulse generation by the DFB dye laser with traveling-wave pumping

A system of equations for pulse generation by a DFB dye laser with spatiall y modulated traveling-wave pumping is obtained and investigated using numer ical simulation. Analytical expressions are derived for the coefficients of amplification and the coupling of counterpropagating pulses. It is shown t hat the traveling-wave pumping in a range of optimum parameters allows prac tically unidirectional generation of a single ultrashort pulse (USP) to be provided. Its duration is several times as short as for a conventional DFB laser with pumping in a steady-state regime. The results obtained agree qua litatively with the available experimental data on the kinetics of pulse ge neration by the dye DFB laser with traveling-wave pumping.