Numéro
J. Phys. IV France
Volume 01, Numéro C7, Décembre 1991
2nd International Conference
Laser M2P
Page(s) C7-315 - C7-318
DOI http://dx.doi.org/10.1051/jp4:1991784
2nd International Conference
Laser M2P

J. Phys. IV France 01 (1991) C7-315-C7-318

DOI: 10.1051/jp4:1991784

MODELLING OF MODE OVERLAP IN LONGITUDINALLY PUMPED SOLID STATE LASERS

C. PFISTNER, P. ALBERS and H.P. WEBER

Institute of Applied Physics, University of Berne, Sidlerstr. 5, CH-3012 Berne, Switzerland


Abstract
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.



© EDP Sciences 1991