Abstract
ABSTRACT We report here a significant enhancement in side-pumped solar laser collection efficiency and solar-to-laser conversion efficiency by a ring-array primary concentrator. A single and a dual-rod side-pumping configuration were numerically investigated. In the former, a thick laser rod was pumped with the full collection area of the ring-array solar concentrator. In the latter, two thin laser rods were pumped simultaneously. 49.70 W continuous-wave multimode solar laser power, corresponding to 29.06 W/m2 collection efficiency, and 3.06% solar-to-laser power conversion efficiency were numerically attained for the dual-rod side-pumping scheme, being 1.65 and 1.26 times higher than the previous experimental records with Nd:YAG side-pumping configurations. A three-folding-scheme single laser beam technique is presented, enabling a significant improvement of laser beam quality factors.
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