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SAID MEHELLOU1,2,* , FERHAT REHOUMA1,2
This paper presents a numerical investigation in the enhancement of the sunlight pumped laser performance using a system of ring-array sunlight flux concentrator. The sunlight resulting from the focal zone of a ring-array concentrator of 1.0 m diameter is further focused by an aspheric lens of fused silica material inside a Nd doped YAG rod (Neodymium-doped Yttrium Aluminum Garnet) of 4.0 mm diameter and 16 mm length housed in a conically shaped pump cavity. A computed sunlight pumped laser power of 31.0 W is obtained with a laser oscillation started for a pump power of 153.84 W, 5.2 % slope efficiency, and 4.13 % solar-to-laser power conversion efficiency. The achieved solar laser power resulted in a collection efficiency of a 39.5 W ∕ m2 , representing 1.030 and 1.035 times greater than the record results by the same kind of concentrator. 0.032 W brightness figure of merit is also computed, corresponding to 1.60 and 1.52 times more than the previous records. More importantly, a large improvement in thermal performance is achieved with a maximum stress intensity of 106.2 N ∕ mm2 , being nearly 50% lower than the previous results.
Thermal performance, Ring-array sunlight flux concentrator, Sunlight-pumped laser, Nd doped YAG medium.
SAID MEHELLOU, FERHAT REHOUMA, Advancement of sunlight-pumped-laser performance by a ring-array sunlight concentrator, Optoelectronics and Advanced Materials - Rapid Communications, 18, 7-8, July-August 2024, pp.325-333 (2024).
Submitted at: Feb. 14, 2024
Accepted at: Aug. 1, 2024
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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