27.5 W/m2 collection efficiency solar laser using a diffuse scattering cooling liquid

Conor Smyth (Lead / Corresponding author), Shamil Mirkhanov, Adrian Quarterman, Keith Wilcox

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Abstract

We report a solar pumped solid state laser using a 20 mm long, 3 mm diameter neodymium-doped yttrium aluminum garnet laser rod. This rod was placed in a liquid cooling chamber using a water–white-emulsion-paint mix. This mix provides cooling for the laser crystal and also doubles as a diffuse light scattering liquid. This enhances sunlight scattering and leads to a greater absorption in the laser rod. We numerically model the solar absorption in the laser rod using a ray-tracing model and predict a 2.6 times enhancement in absorption when a 98% reflective diffuse scatter is modelled compared to 0% scattering. We experimentally demonstrated this, showing a 2.58 times increase in average output power of the solar laser compared to the use of pure water as a cooling liquid. Using the water–white-paint scattering cooling liquid, we demonstrated a laser with an output power of 2.3 W and with a collection efficiency of 27.5 W∕m2.

Original languageEnglish
Pages (from-to)4008-4012
Number of pages5
JournalApplied Optics
Volume57
Issue number15
Early online date6 Apr 2018
DOIs
Publication statusPublished - 20 May 2018

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Keywords

  • High power lasers
  • Laser modes
  • Laser systems
  • Nd: YAG lasers
  • Rod lasers
  • Solid state lasers

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