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100 W-class solar pumped laser for sustainable magnesium-hydrogen energy cycle

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14 Author(s)
Yabe, T. ; Entropia Laser Initiative, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8552, Japan ; Bagheri, B. ; Ohkubo, T. ; Uchida, S.
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A solar pumped laser system with 7%–9% slope efficiencies has been developed. A Fresnel lens (2×2 m, f=2000 mm) is mounted on a two-axis sun tracker platform and focuses solar radiation toward laser cavity, which embraces Cr:Nd:yttrium aluminum garnet ceramic rod. The maximum emitted laser power is 80 W corresponding to maximum total area performance of 20 W/m2 for the Fresnel lens area. This solar laser system would be used as a section of power plant in a magnesium energy cycle as a cost-efficient solar energy converter. Using direct solar radiation into laser, 4.3% net conversion efficiency has been achieved.

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Journal of Applied Physics  (Volume:104 ,  Issue: 8 )