High conversion efficiency solar laser pumping by a light-guide/2D-CPC cavity |
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Authors: | Rui Pereira Dawei Liang |
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Institution: | CEFITEC, Departamento de Física, FCT, Universidade Nova de Lisboa, 2825, Campus de Caparica, Portugal |
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Abstract: | 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/m2. The tracking error dependent laser power losses are lower than 4%. A small scale prototype was constructed and tested, reaching 8.1 W/m2 conversion efficiency. |
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Keywords: | Lasers Solid-state Pumping Solar-pumped |
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