25 W/m2 collection efficiency solar-pumped Nd:YAG laser with by heliostat-parabolic mirror system

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A large aspheric fused silica lens was used to couple efficiently the concentrated solar radiation from the focal zone of a 1.5-m-diameter primary concentrator into a 4-mm-diameter, 35-mm-long Nd:YAG single-crystal rod within a conical pump cavity. Continuous-wave laser power of 29.3 W was measured, attaining 25.0  W/m225.0  W/m2 solar laser collection efficiency, corresponding to a 19% increase over the previous record. Its laser beam figure of merit—the ratio between laser power and the product of 푀2푥Mx2, 푀2푦My2 beam quality factors—of 0.01 W is 1.6 times higher than that of a direct tracking solar laser with 30  W/m230  W/m2 collection efficiency. A strong dependency of solar laser power on laser resonator cavity length was found.
Original languageEnglish
Pages (from-to)7712-7717
Number of pages6
Issue number27
Publication statusPublished - 20 Sep 2016



  • Continuous wave lasers
  • Efficiency
  • Fused silica
  • Laser beams
  • Neodymium lasers
  • Pumping (laser)
  • Single crystals
  • Beam quality factor
  • Collection efficiency
  • ConConcentrated solar radiation
  • Figure of merits
  • ND : YAG lasers
  • Nd:YAG single crystals
  • Parabolic mirrors
  • Resonator cavities

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