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

Abstract

A system of equations for pulse generation by a DFB dye laser with spatially modulated traveling- wave pumping is obtained and investigated using numerical simulation. Analytical expressions are derived for the coefficients of amplification and coupling of counterpropagating pulses. It is shown that the traveling-wave pumping in a range of optimum parameters allows practically unidirectional generation of a single ultrashort pulse (USP) to be provided. Its duration is several times as short as the one in the case of a conventional DFB laser with pumping in the steady-state regime. The results obtained agree qualitatively with the available experimental data on kinetics of pulse generation by the dye DFB laser with traveling-wave pumping.