Fabrication of the freeform Fresnel lens by swinging-rotating diamond ruling

Chen, Junnan; Yu, Yangqin; Gu, Peng; Zhu, Limin; Zhang, Zhe; Zhang, Xinquan

doi:10.1016/j.jmapro.2024.03.069

Journal of Manufacturing Processes

2024

DOI: 10.1016/j.jmapro.2024.03.069

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Fabrication of the freeform Fresnel lens by swinging-rotating diamond ruling

Junnan Chen,

Yangqin Yu,

Peng Gu

et al.

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2024

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Differentiable design of compact imaging systems with curved Fresnel optics

Cerpentier,

Meuret

2024

Opt. Express

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Phase elements can improve the performance and reduce the size of imaging systems, thanks to the additional degrees of freedom that are offered by the independent phase gradient on top of a refractive/reflective surface. Possible implementations include diffractive elements or metasurfaces, but these suffer from diffractive dispersion. Similar optical functionality however can be provided by thin, curved Fresnel optics, which solely rely on refraction. In this study, a differentiable raytracing framework is presented that offers precise and rapid optimization of curved Fresnel surfaces, by modeling them as a combination of a distinct geometrical and refractive surface, both differentiable with respect to the imaging merit function. The method is demonstrated by designing a compact imaging and projection lens, both with high numerical aperture. The paper analyzes the impact of Fresnelizing the optimized "theoretical" surfaces on both the imaging performance and transmission efficiency. It furthermore shows how the system performance can be enhanced through dedicated post-processing steps, emphasizing the practical relevance of compact Fresnel optics.

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Differentiable design of compact imaging systems with curved Fresnel optics

Cerpentier,

Meuret

2024

Opt. Express

View full text Add to dashboard Cite

show abstract

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Fabrication of the freeform Fresnel lens by swinging-rotating diamond ruling

Cited by 1 publication

References 26 publications

Differentiable design of compact imaging systems with curved Fresnel optics

Differentiable design of compact imaging systems with curved Fresnel optics

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