The sustainable energy cycle has been proposed with solar energy and magnesium [Mg] as an energy carrier. In this study, Mg was recovered thermo-chemically from a magnesium-oxide [MgO] by solar-laser induced ablation. As the result, it is clarified that Mg reproduction with laser depends on the chamber pressure and silicon [Si] molar ratio as the reducing agent. At the 1.2×105 W/cm2 of the laser and 105 Pa, the Mg production efficiency was obtained the maximum value at 10.8 mg/kJ, which is higher than 5.2 mg/kJ of conventional method (Pidgeon method).
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