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In our paper we investigated the influence of the mode overlap on the efficiency of longitudinally pumped solid state lasers. In a theoretical part we enhanced an existing model for four level lasers from idealized cylindrical modes to arbitrary pump and laser modes in a random relative position. Theoretical predictions were confirmed experimentally with an end-pumped Nd:YAG rod operated at 1064 nm. To investigate the effect of misalignment on the efficiency we used a Ti-Sapphire pump laser which could be displaced relative to the laser beam. In a second experiment a diode laser equipped with coupling optics served as the pump source for the same resonator. This resulted in a 20 % decrease in slope efficiency compared to the Ti-Sapphire pumped system due to the limited mode overlap produced by the diode coupling optics

MODELLING OF MODE OVERLAP IN LONGITUDINALLY PUMPED SOLID STATE LASERS