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YANG Yi, ZHANG Xiangxiang, LU Yu, KONG W J. Design of solar concentrated uniform line light source of composite ellipsoid cavity[J]. Chinese Optics. doi: 10.37188/CO.2022-0138
Citation: YANG Yi, ZHANG Xiangxiang, LU Yu, KONG W J. Design of solar concentrated uniform line light source of composite ellipsoid cavity[J]. Chinese Optics. doi: 10.37188/CO.2022-0138

Design of solar concentrated uniform line light source of composite ellipsoid cavity

doi: 10.37188/CO.2022-0138
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  • Corresponding author: 2013040009@tute.edu.cn
  • Received Date: 21 Jun 2022
  • Accepted Date: 04 Aug 2022
  • Available Online: 15 Sep 2022
  • Objective: In order to implement a solar direct pumping slab high power laser, a linear uniform high-power density pump source is studied. Method: In this paper, the design method of a high-power density uniform linear light source is proposed by combining the first-order concentrating system with seven confocal ellipsoids to form a composite ellipsoid cavity. Each ellipsoid realizes the equal radiation flux segmentation of the circular first focal spot. The mirror imaging characteristics do not significantly decrease the peak power density. After decomposition, the mirror spot forms a uniform linear light source at the second point of focus. The mathematical model of equal radiation flux is given by coordinate changes, and the rotation and translation parameters of each ellipsoid are solved by the annealing algorithm. Result: The first-order system is composed of a Fresnel lens with a radius of 30 mm, a focal length of 70 mm and with a = 3.4 mm, c = 3.15 mm single ellipsoidal cavity. The second-order composite ellipsoidal cavity concentrating system is attached. The effective length is 12 mm, the peak power density is 1.09 × 106 W/m2, and the uniformity is 95.46 %. Conclusion: Compared with the contribution of each ellipsoid parameter to the uniformity, the uniformity effect is significantly improved when the rotation parameter θ of the middle ellipsoid is 1.4°. The change of the edge ellipsoid parameter Δ has a significant influence on the effective length of the linear light source, and its optimal value is 0.53 mm.

     

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