Parabolic ring array concentrator for solar-pumped laser

The defects of Fresnel lens was discussed and the design principle of parabolic ring array for solar-pumped laser was presented.A two-stage solar concentrator with parabolic ring array,Fresnel lens and compound parabolic concentrator(CPC)was designed.Ray-tracing simulations reveal that compared with the traditional Fresnel lens and CPC two-stage solar concentrator,the new concentrator can improve the optical efficiency by 18.5%and is more suitable for large aperture and high concentration ratio converging applications.