High-power high-brightness solar laser approach for renewable Mg recovery from MgO

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Abstract

Hydrogen and heat energy from the reaction of magnesium with water can be used for engines and fuel cells. However, at least 4000 K is necessary for magnesium oxide reduction. Ultra high brightness solar-pumped lasers become essential to make this renewable process technology efficient and economically competitive. 2.3 mg/kJ solar laser - induced magnesium production efficiency has been achieved by T. Yabe et al., in 2012, by focusing a 53 W solar laser beam on a mixture of MgO with Si as reducing agent. This result is however far from the 12.1 mg/kJ attained with 2 kW/mm2 CO2 laser beam. To improve substantially the solar laser - induced Mg production efficiency, a simple high-power, high brightness Nd:YAG solar laser pumping approach is proposed. The solar radiation is both collected and concentrated by four Fresnel lenses, and redirected towards a Nd:YAG laser head by four plane folding mirrors. A fused-silica secondary concentrator is used to compress the highly concentrated solar radiation to a laser rod. Optimum pumping conditions and laser resonator parameters are found through ZEMAX

Original languageEnglish
Title of host publicationSecond International Conference on Applications of Optics and Photonics
EditorsRogerio Nunes Nogueira, Manuel Filipe P. C. Martins Costa
PublisherSPIE-International Society for Optical Engineering
ISBN (Electronic)978-1-62841-361-8
DOIs
Publication statusPublished - 2014
Event2nd International Conference on Applications of Optics and Photonics - Aveiro, Portugal
Duration: 26 May 201430 May 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE-International Society for Optical Engineering
Volume9286
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference2nd International Conference on Applications of Optics and Photonics
CountryPortugal
CityAveiro
Period26/05/1430/05/14

Keywords

  • Fresnel lens
  • High-brightness
  • High-power
  • Laser cavity
  • Magnesium
  • MgO
  • Nd:YAG
  • Solar-pumped laser

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