Core-doped Nd:YAG disk solar laser uniformly pumped by six Fresnel lenses

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Abstract

A novel solar laser uniformly pumped by six Fresnel lenses is proposed here. The incident solar radiation is firstly collected and concentrated by six 0.8 m diameter Fresnel lenses and then reflected by other six plane mirrors to a central focal zone, where a laser head is mounted. About 2.5 kW solar power with 3.5 W/mm2 peak solar flux can be achieved in the focal zone. The laser head is composed of a fused silica six-sphere type secondary concentrator that further compresses the concentrated solar power from the six Fresnel lenses-plane mirrors to a core-doped YAG Nd3+:YAG ceramic disk. Optimum pumping parameters and solar laser output powers are found through ZEMAX non-sequential ray-tracing and LASCAD laser cavity analysis, respectively. The laser resonant cavity is formed by a PR 1064 nm output coupler and a HR 1064 nm plane reflector. An 8 mm diameter central hole is drilled through the six-sphere type concentrator to allow the extraction of laser power from the disk. Since only 16 % of the useful solar power is absorbed by the Nd:YAG medium, for 950 W/m2 of terrestrial solar irradiation, the effective solar pump power of 456 W is assumed in ray-tracing analysis. 72.2 W of multimode laser power is predicted for an 8 mm diameter gain medium embedded within a conical undoped YAG cladding, reaching the collection efficiency of 24.1 W/m2. M2 = 16.6 is numerically calculated, corresponding to the brightness figure of merit of 0.26 W. A near uniform absorbed pump profile is achieved.

Original languageEnglish
Title of host publication8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications
EditorsM. F. P. C. M. Costa
PublisherSPIE-International Society for Optical Engineering
ISBN (Print)978-0-8194-9601-0
DOIs
Publication statusPublished - 2013
Event8th Iberoamerican Optics Meeting, RIAO 2013 and 11th Latin American Meeting on Optics, Lasers, and Applications, OPTILAS 2013 - Porto, Portugal
Duration: 22 Jul 201326 Jul 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8785
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference8th Iberoamerican Optics Meeting, RIAO 2013 and 11th Latin American Meeting on Optics, Lasers, and Applications, OPTILAS 2013
CountryPortugal
CityPorto
Period22/07/1326/07/13

Keywords

  • Beam profile
  • Core-doped
  • Fresnel lens
  • Laser beam
  • Nd:YAG
  • Solar-pumped lasers

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