EVOLUTION OF SPATIAL-ANGULAR CHARACTERIST ICS OF LAMP-PUMPED DYE-LASERS

Spatial-angular characteristics of dye lasers pumped by coaxial pulse lamps are studied experimentally. Laser radiation divergence is shown to be determined chiefly by the competition of refractive and closed b eam trajectories. The refractive trajectories arise owing to thermal d istortions of the active medium, whereas the closed trajectories are d ue to Fresnel reflection on the walls of the cell. The experimental re sults are in a satisfactory agreement with the previous studies. Recom mendations on the desing of efficient dye lasers with high radiation d irectionality are given.