Designing compact and ultra-efficient aspherical lenses with prescribed irradiance properties for extended light sources

摘要

Direct design of illumination optics for extended light sources is challenging but rewarding. Most of the current direct methods, which are developed specifically for the treatment of prescribed intensity designs, usually cannot yield acceptable illumination in the near field where the influence of lens size on the irradiance distribution cannot be ignored. Here, for the first time, to the best of our knowledge, we develop a direct method for designing aspherical illumination lenses with prescribed irradiance properties for extended sources in 3D geometry. The proposed method is valid in both near field and far field. The proposed method is numerically and experimentally evaluated. The results obtained show the effectiveness of the proposed method.