High conversion efficiency solar laser pumping by a light-guide/2D-CPC cavity

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A simple and efficient light-guide/2D-CPC solar pumping approach is proposed. A fused silica light-guide assembly is used to transmit 6 kW concentrated solar power from the focal spot of a large parabolic mirror to the entrance aperture of a 2D-CPC pump cavity, where a long and thin Nd:YAG rod is efficiently pumped. Numerical calculations are made for different light-guides, 2D-CPC cavities and laser rods. The laser output power is investigated through finite element analysis. With 4 mm diameter rod, the maximum calculated laser power of 75.8 W is obtained, corresponding to the conversion efficiency of more than 11 W/m(2). The tracking error dependent laser power losses are lower than 4%. A small scale prototype was constructed and tested, reaching 8.1 W/m(2) conversion efficiency. (C) 2008 Elsevier B.V. All Fights reserved.
Original languageUnknown
Pages (from-to)1385-1392
JournalOptics Communications
Issue number7
Publication statusPublished - 1 Jan 2009

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