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/mm2peak 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/m2of 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. © (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Original languageUnknown
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Pagesnr. 87850W
DOIs
Publication statusPublished - 1 Jan 2013
Event8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications -
Duration: 1 Jan 2013 → …

Conference

Conference8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications
Period1/01/13 → …

Cite this

Liang, D. (2013). Core-doped Nd:YAG disk solar laser uniformly pumped by six Fresnel lenses. In Proceedings of SPIE - The International Society for Optical Engineering (pp. nr. 87850W) https://doi.org/10.1117/12.2030434