Numerical modeling of a four-rod pumping scheme for improving TEM00-mode solar laser performance

Joana Almeida; Dawei Liang; Bruno D. Tibúrcio; Dário Garcia; Cláudia R. R. Vistas

doi:10.1117/1.JPE.9.018001

20 February 2019 Numerical modeling of a four-rod pumping scheme for improving TEM₀₀-mode solar laser performance

Joana Almeida, Dawei Liang, Bruno D. Tibúrcio, Dário Garcia, Cláudia R. R. Vistas

Author Affiliations +

Funded by: Science and Technology Foundation of Portuguese Ministry of Science, Technology and Higher Education (FCT—MCTES), Bruno D. Tibúrcio, Dario Garcia, Cláudia R. Vistas

Journal of Photonics for Energy, Vol. 9, Issue 1, 018001 (February 2019). https://doi.org/10.1117/1.JPE.9.018001

Abstract

A four-rod solar pumping concept is proposed for the significant improvement in TEM₀₀-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. TEM₀₀-mode laser output of 7.22 W is numerically obtained from each rod, resulting in 28.9 W (4 × 7.22 W) total TEM₀₀-mode power from the four-rod scheme with 9.41 W / m² 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 TEM₀₀-mode solar laser stability and thermal performance are also numerically demonstrated.

Citation Download Citation

Joana Almeida, Dawei Liang, Bruno D. Tibúrcio, Dário Garcia, and Cláudia R. R. Vistas "Numerical modeling of a four-rod pumping scheme for improving TEM₀₀-mode solar laser performance," Journal of Photonics for Energy 9(1), 018001 (20 February 2019). https://doi.org/10.1117/1.JPE.9.018001

Received: 26 November 2018; Accepted: 29 January 2019; Published: 20 February 2019

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