Abstract
We report here significant progresses in both multimode and TEM00-mode solar-pumped laser collection efficiencies by end-side-pumping a 4.0mm diameter 35mm length Nd: YAG single-crystal rod with a heliostat-parabolic mirror solar energy concentration system. An aspheric fused silica lens was used to couple the concentrated solar radiations from the focal zone of a 1.4m effective diameter parabolic mirror into the laser rod within a conical pumping cavity. 37.2W continuous-wave multimode solar laser power was measured, corresponding to 31.5W/m2 multimode laser collection efficiency and 8.9% slope efficiency. 9.3W continuous-wave TEM00-mode (M2 ≤1.2) solar laser power and consequently 7.9W/m2 fundamental-mode laser collection efficiency was registered, doubling the previous record.
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