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A 40Wcw Nd:YAG solar laser pumped through a heliostat: A parabolic mirror system
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Orientador(es)
Resumo(s)
Solar-pumped solid-state lasers are promising for renewable extreme-temperature material processing. Here, we report a significant improvement in solar laser collection efficiency by pumping the most widely used Nd:YAG single-crystal rod through a heliostat-parabolic mirror system. A conical-shaped fused silica light guide with 3D-CPC output end is used to both transmit and compress the concentrated solar radiation from the focal zone of a 2 m diameter parabolic mirror to a 5 mm diameter Nd:YAG rod within a conical pump cavity, which enables multi-pass pumping through the laser rod. 40 W cw laser power is measured, corresponding to 13.9 W m-2 record-high collection efficiency for the solar laser pumped through a heliostat-parabolic mirror system. 2.9% slope efficiency is fitted, corresponding to 132% enhancement over that of our previous pumping scheme. A 209% reduction in threshold pump power is also registered.
Descrição
This research Project (no. PTDC/FIS/103599/2008) was funded by the Science and Technology Foundation of the Portuguese Ministry of Science, Technology and Higher Education (FCT-MCTES). Financial support by the Access to Research Infrastructures Activity in the 7th Framework Programme of the EU (SFERA Grant Agreement no. 228296) is gratefully acknowledged.
Palavras-chave
Atomic and Molecular Physics, and Optics Instrumentation Condensed Matter Physics Industrial and Manufacturing Engineering SDG 7 - Affordable and Clean Energy