Journal
OPTICS EXPRESS
Volume 19, Issue 27, Pages 26399-26405Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.026399
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Funding
- Science and Technology Foundation of Portuguese Ministry of Science, Technology and Higher Education (FCT-MCTES) [PTDC/FIS/103599/2008]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/103599/2008] Funding Source: FCT
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The recent progress in solar-pumped laser with Fresnel lens and Cr:Nd:YAG ceramic medium has revitalized solar laser researches, revealing a promising future for renewable reduction of magnesium from magnesium oxide. Here we show a big advance in solar laser collection efficiency by utilizing an economical Fresnel lens and a most widely used Nd:YAG single-crystal rod. The incoming solar radiation from the sun is focused by a 0.9 m diameter Fresnel lens. A dielectric totally internally reflecting secondary concentrator is employed to couple the concentrated solar radiation from the focal zone to a 4 mm diameter Nd:YAG rod within a conical pumping cavity. 12.3 W cw laser power is produced, corresponding to 19.3 W/m(2) collection efficiency, which is 2.9 times larger than the previous results with Nd:YAG single-crystal medium. Record-high slope efficiency of 3.9% is also registered. Laser beam quality is considerably improved by pumping a 3 mm diameter Nd:YAG rod. (C) 2011 Optical Society of America
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