Abstract
We propose a novel design methodology to tackle the multi-surface catadioptric freeform lens design for off-axis road illumination applications based on an ideal source. The lens configuration contains an analytic refractive entrance surface, an analytic total internal reflective (TIR) surface and two freeform exit surfaces. A curl-free energy equipartition is established between the source and target plane and applied to implement the composite ray mapping mechanism. Furthermore, the analytic TIR surface and refractive entrance surface are optimized for the minimal Fresnel losses and surface error based on Genetic algorithm (GA). The results show a significant improvement on illuminance uniformity and ultra-high transfer efficiency compared to the design employed our proposed method in [Zhu et al., Opt. Express 26, A54-A65 (2018)].
Highlights
Many basic approaches are developed for the design of freeform illumination optics based on an ideal source assumption such as ray mapping method [1, 3,4,5, 15], supporting quadric method (SQM) [16, 20, 21] and Monge-Ampére equation (MA) [26]
We propose a novel multi-surface freeform catadioptric lens configuraion with four elaborately designed surfaces as well as an efficient methodology combined with the ray mapping method and optimization process based on genetic algorithm (GA)
We proposed a novel configuration of a four-surface catadioptric freeform lens for off-axis illumination applications
Summary
Many basic approaches are developed for the design of freeform illumination optics based on an ideal source assumption such as ray mapping method [1, 3,4,5, 15], supporting quadric method (SQM) [16, 20, 21] and Monge-Ampére equation (MA) [26]. One of the most famous multiple freeform surface design method is SMS3D proposed by Pablo Benítez and Juan C.Minano [10]. It allows the generation of N optical freeform surfaces coupling N pairs of ray bundles. In paper [19], the authors presented a novel optimization method for designing double freeform surfaces specified by scalar bicubic spline function. We propose a novel multi-surface freeform catadioptric lens configuraion with four elaborately designed surfaces as well as an efficient methodology combined with the ray mapping method and optimization process based on genetic algorithm (GA). The results show superior optical performance and ultra-high collection efficiency compared to our proposed result in Ref. [28] for off-axis road illumination
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