Multimode solid-state laser with longitudinally nonuniform pump: TSD+ approximation

The influence of longitudinal pump nonuniformity on the behaviour of a mult imode standing wave solid-state laser is studied. It is found that this non uniformity leads to changes in both the optical spectrum and in the spectru m of relaxation oscillations in comparison with a uniformly pumped laser. R esults obtained for two laser models, the global rate equation model and th e TSD+ model as its simplified version, are compared. It allows us to verif y the validity of the TSD+ model and define the scope of its application.