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In solar-pumped lasers, the conversion efficiency is declining due to the concentration of heat in the laser medium. To solve this problem, a multiple compound parabolic concentrator (MCPC) cavity was proposed to prevent concentration in the previous study. However, extending that cavity length has not been considered. In this study, we investigated the possibility of improving conversion efficiency and dispersing heat by extending the length of the solar cavity and the laser medium. We discussed the absorption density distribution of solar power into the laser medium. As a result, the dispersion of absorption power density of the MCPC cavity was about 40.8–44.7% compared to the Cone type, which is the traditional solar cavity for solar-pumped lasers. Therefore, it is possible to extend the length of both the cavity and the laser medium while maintaining the uniformity effect of the MCPC type of solar cavity, and the conversion efficiency is expected to be improved.

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A Numerical Study of Solar-Pumped Lasers with Multiple Compound Parabolic Concentrators with Length Extension

  • 会议论文

  • 发表日期：

    2025年

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  • Ryota Yamada,
  • Tomomasa Ohkubo,
  • Haochen Lou,
  • Hirozumi Munakata,
  • Ei-ichi Matsunaga,
  • Yuji Sato

摘要

In solar-pumped lasers, the conversion efficiency is declining due to the concentration of heat in the laser medium. To solve this problem, a multiple compound parabolic concentrator (MCPC) cavity was proposed to prevent concentration in the previous study. However, extending that cavity length has not been considered. In this study, we investigated the possibility of improving conversion efficiency and dispersing heat by extending the length of the solar cavity and the laser medium. We discussed the absorption density distribution of solar power into the laser medium. As a result, the dispersion of absorption power density of the MCPC cavity was about 40.8–44.7% compared to the Cone type, which is the traditional solar cavity for solar-pumped lasers. Therefore, it is possible to extend the length of both the cavity and the laser medium while maintaining the uniformity effect of the MCPC type of solar cavity, and the conversion efficiency is expected to be improved.