Optimization of freeform lightpipes for light-emitting-diode projectors

Fournier, Florian; Rolland, Jannick P.

doi:10.1364/ao.47.000957

Cited by 56 publications

(23 citation statements)

References 16 publications

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“…We have analyzed three different contour shapes (see also Fig. 11 The three previously mentioned shapes are simulated in ASAP on the basis of étendue efficiency. A classic choice for the shape of the contour is parabolic, resulting in a CPC for an incoming light cone with a certain angle θ in (inside the dielectric) towards an outgoing light cone with a certain angle θ out (inside the dielectric).…”

Section: Design Of a Dedicated Collimatormentioning

confidence: 99%

Incoupling and outcoupling of light from a luminescent rod using a compound parabolic concentrator

et al. 2015

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Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/05/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspxAbstract. Secondary optics that allow for the integration of a light-emitting diode (LED)-based luminescent light source into various étendue-limited applications-such as projection systems-are investigated. Using both simulations and experiments, we have shown that the optical efficacy of the luminescent light source can be increased using a collimator. A thorough analysis of the influence of the collimator's refractive index on the optical outcoupling and luminance is investigated and it is shown that it is most optimal to use a refractive index of 1.5. The optimal shape of the collimator is equal to that of a compound parabolic concentrator. Experimental results show that by using a collimator, we can improve the amount of outcoupled light with a factor of 1.8 up to 2.1 depending on the used optical configuration of the LED-based luminescent light source.

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Section: Design Of a Dedicated Collimatormentioning

confidence: 99%

Incoupling and outcoupling of light from a luminescent rod using a compound parabolic concentrator

et al. 2015

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“…This is an inverse problem, the number of freeform surfaces which should be used depends on the design requirements. The design methods of freeform illumination optics can be broken into two groups according to the influence of the spatial or angular extent of an actual light source on the design: zero‐étendue algorithms based on ideal source assumption (point light sources or parallel light beams) and algorithms for extended light sources . When the influence of the spatial or angular extent of a light source can be ignored, the light source can be considered as an ideal source (a point source or a parallel beam) and the inverse problem can be converted into a well‐defined mathematical problem.…”

Section: Introductionmentioning

confidence: 99%

Design of Freeform Illumination Optics

Feng

Zheng

et al. 2018

Laser & Photonics Reviews

131

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Freeform optics constitutes a new technology that is currently driving substantial changes in illumination design. It liberates designers and engineers from restrictions of optical surface geometry, enabling them to achieve compact, lightweight, and efficient illumination systems with excellent optical performance. Freeform optics is currently used widely for both fundamental research and practical applications. This Review focuses on the design of freeform illumination optics, which is a key factor in advancing the development of illumination engineering. The design methods of freeform illumination optics can be divided into two groups: zero‐étendue algorithms based on ideal source assumption and design algorithms for extended light sources. The zero‐étendue algorithms include ray mapping method, Monge–Ampère equation method, and supporting quadric method. The algorithms for extended sources include illumination optimization, feedback design, and simultaneous multiple surfaces method. The characteristics and limitations of these design methods are illustrated and a summary of these methods with future outlooks is also given.

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“…But these methods are either complicate or time-consuming. In this paper, based on one specified project, optimization design [6] is used. The designed terahertz collimating lens can meet the requirements of the project more quickly and efficiently.…”

Section: Introductionmentioning

confidence: 99%

The Optimization of Terahertz Collimating Lens

Wang

2016

Proceedings of the 2015 International Conference on Communications, Signal Processing, and Systems

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Terahertz is widely used in nondestructive testing, sensing, remote sensing of broadband communications, and other important key areas. However, terahertz applications must depend on the lenses or reflectors to match and couple radiation source. Based on one specified engineering requirements, the collimating optimization method is applied in this article for terahertz lens. The aspheric parameters of the surface are used as optimization parameters. A terahertz collimating plane-convex lens is designed. Results show that the designed lens conducts the terahertz radiation to the specified area with high efficiency. The lens helps the terahertz detector to receive and conduct the terahertz radiation and it fully meets the specified engineering requirements.

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Optimization of freeform lightpipes for light-emitting-diode projectors

Cited by 56 publications

References 16 publications

Incoupling and outcoupling of light from a luminescent rod using a compound parabolic concentrator

Incoupling and outcoupling of light from a luminescent rod using a compound parabolic concentrator

Design of Freeform Illumination Optics

The Optimization of Terahertz Collimating Lens

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