Design of a high brightness solar-pumped laser by light-guides

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To improve solar-pumped laser output performance, a compact fused silica light-guide assembly is combined with a 2V-shaped cavity to achieve uniform pumping along a Nd:YAG rod. Based on both refractive and total internal reflection principles, the light-guide assembly provides an effective approach in both guiding and redistributing the highly concentrated solar radiation. A near Gaussian profile focal spot of a 1.5 m diameter parabolic mirror is transformed into an intense rectangular light column, uniformly distributed along the 2D-CPC output end of the assembly, avoiding the generation of hot pump spots within the laser rod. By trapping the pump light within the 2V-shaped cavity, efficient multi-pass absorption is achieved. Optimum pumping parameters and solar laser output powers are found through ZEMAX © non-sequential ray-tracing and LASCAD © laser cavity analysis. The solar laser output performances of both single-crystal and core-doped Nd:YAG rods are compared. Laser beam brightness figure of merit B=9.0×10 -1 W is calculated, which is 310 more than the most recent record. About 16.4 W/m 2 collection efficiency is also numerically predicted.

Original languageEnglish
Pages (from-to)5327-5333
Number of pages7
JournalOptics Communications
Issue number24
Publication statusPublished - 1 Nov 2012


  • Brightness
  • Light-guide
  • Nd:YAG


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