Abstract
Pumping of a Cr 3+:LiSAF laser through a butt-coupled optical fiber is investigated for a compact all-solid-state laser assembly. Theoretical space-dependent rate equation analysis is used to predict the output characteristics of the Cr 3+:LiSAF laser for different cavity parameters, optical fiber characteristics, and Cr 3+ doping rates. The effect of the positional and angular mismatch of the pump beam with respect to the laser mode is also included in the model. The analysis explicitly shows that the slope efficiency can be improved by improving the mode coupling volume in the Cr 3+:LiSAF crystal. Experimental output characteristics are reported when the Cr 3+:LiSAF laser is pumped through optical fibers with different combinations of core diameter and numerical aperture. The experimental results are in good agreement with the theoretical modeling.
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