2020
DOI: 10.1364/oe.397983
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Freeform Fresnel lenses with a low number of discontinuities for tailored illumination applications

Abstract: Most work in the field of freeform lens design has been focused on finding design algorithms for continuous freeform lens surfaces which transform an arbitrary ingoing light distribution into an arbitrary outgoing distribution. The shape of the resulting continuous lens surfaces depends fully on the source and target light distribution for which the lenses are tailored. In some cases this results in large, voluminous optical components which depending on the application are not practical. Fresnel lenses can ha… Show more

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Cited by 14 publications
(4 citation statements)
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“…Freeform optics provides the ability to consolidate various "basic" elements (such as lenses and mirrors) into singlepiece structures, like multichannel lenses or multifaceted mirrors. This leads to systems that are compact and have fewer components, simplifying assembly and alignment ( [1], [2]). This paper describes a multistage optical system designed for a LiDAR device, specifically for a helicopter landing assistance module.…”
Section: Description Of the Optical Systemmentioning
confidence: 99%
“…Freeform optics provides the ability to consolidate various "basic" elements (such as lenses and mirrors) into singlepiece structures, like multichannel lenses or multifaceted mirrors. This leads to systems that are compact and have fewer components, simplifying assembly and alignment ( [1], [2]). This paper describes a multistage optical system designed for a LiDAR device, specifically for a helicopter landing assistance module.…”
Section: Description Of the Optical Systemmentioning
confidence: 99%
“…At present, most of the published research on freeform illumination optics design is primarily involved in achieving a specific illuminance distribution on the pre-determined target [13], [14], [17], [18], [19], [20], [21]. If the relation between illuminance distribution and intensity distribution can be established by a mathematical model, the problem of intensity distribution regulation might be transformed into an illuminance control problem.…”
Section: A Light Conversion Strategymentioning
confidence: 99%
“…Hence, the convergence criterion considering height information provides a significant refinement effort on steep areas of the surface. For example, in the measurement of Fresnel mirrors [19,20], we show that contemporary algorithms tend to ignore the desired curvature information, which is often in the low varying reflective region, while generating denser grids on sharp edges. Such excessively dense grids challenge both the positioning accuracy of the motion stages and the path planning strategy.…”
Section: Introductionmentioning
confidence: 99%