Abstract

In this study we included an improved description of the bandwidth limiting tuning elements into a semiclassical model for a synchronously pumped mode-locked dye laser system. This model is an improvement over the traditional rate equation approach since it has detailed representations of the energy levels, rotational distribution, polarization, and coherence effects. For the theory, the new set of equations is solved numerically using the best available values for the various parameters. The solutions produce autocorrelations of the output pulses for a range of length detuning and filters. For the experiments, an acoustooptically mode-locked Ar-ion laser has been used to pump synchronously a rhodamine 6G dye laser. We have used two- and three-plate birefringent filters and a tuning wedge for our bandwidth limiting tuning elements. The transmission and bandwidth of these filters have been carefully measured and incorporated in our theory. The autocorrelation of the pulses has been measured as a function of the length detuning. There is close agreement between experimental pulse shapes and theoretical solutions. Through a sensitivity analysis, it is shown how this model can be used to select values for the transmission and bandwidth of the filter to obtain optimum pulse characteristics.

© 1988 Optical Society of America