Numerical modeling of a four-rod pumping scheme for improving TEM 00 -mode solar laser performance

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Abstract

A four-rod solar pumping concept is proposed for the significant improvement in TEM 00 -mode solar laser performance. A quadrangular pyramidal reflector is used to separate the focused solar rays from a 2.0-m diameter parabolic mirror into four focal spots. Four laser heads, each one consisting of a double-stage biconical lens/conical pump cavity and a small diameter Nd:YAG rod, are placed at each of the four focal zones. TEM 00 -mode laser output of 7.22 W is numerically obtained from each rod, resulting in 28.9 W(4 × 7.22 W) total TEM 00 -mode power from the four-rod scheme with 9.41 W/m 2 collection efficiency. This value is 2.5 times more than that of the numerically calculated laser power collection efficiency from a single-rod pumped by the same parabolic mirror. A brightness conversion efficiency of 0.86% is achieved. Substantial improvements in TEM 00 -mode solar laser stability and thermal performance are also numerically demonstrated.

Original languageEnglish
Article number018001
JournalJournal of Photonics for Energy
Volume9
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • four-rod
  • Nd:YAG.
  • parabolic mirror
  • solar laser
  • solar pumping
  • TEM -mode

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