Abstract

Conventional models oí active mode-locking (AML) of solid-state lasers are based on the treatment of Gaussian pulse transformation in an active medium and a loss modulator.^1,2 Taking into consideration the effects of gain saturation and perturbations of steady-stale solutions due to additional pulses within tire round-trip period allows for obtaining stability criterion for AMΪ.^3,4 The spiking regimes have been investigated in Ref. 5; however, the connection among the regimes and ultrashort pulse parameters has not been treated. The aim of this study was to investigate the mechanism of low-frequency modulation of the pulse train and to find the relationship of these instabilities to pulse-structure evolution and pulse parameters.

© 1991 Optical Society of America