2021
Kim, W.; Cassarly, W. J.; Rolland, J. P.
Connecting tolerancing of freeform surface deformation in illumination optics with the Laplacian magic mirror Journal Article
In: Optics Express, vol. 29, iss. 24, pp. 40559-40571, 2021.
Abstract | Links | BibTeX | Tags: CeFO, Illumination
@article{kim_OE21,
title = {Connecting tolerancing of freeform surface deformation in illumination optics with the Laplacian magic mirror},
author = {W. Kim and W. J. Cassarly and J. P. Rolland},
doi = {https://doi.org/10.1364/OE.442853},
year = {2021},
date = {2021-11-22},
journal = {Optics Express},
volume = {29},
issue = {24},
pages = {40559-40571},
abstract = {This paper presents a methodology for illumination optics tolerancing. Specifically, we investigate tolerancing deformation of a single freeform surface under a point source illumination. Through investigation, we recognized and report here three surface-deformation characteristics that build tolerancing intuitions. First, we show that positive and negative irradiance changes occur together as a consequence of flux conservation. Then, we demonstrate a linear relationship between the steepness of the surface perturbation and the magnitude of the irradiance change. Lastly, we show that the Laplacian magic mirror concept (M. V. Berry [Eur. J. Phys. 27, 109 (2006)) can be expanded to surface deformation tolerancing. Utilizing these surface deformation characteristics, we propose a fast and predictable tolerancing method for a sequential illumination},
keywords = {CeFO, Illumination},
pubstate = {published},
tppubtype = {article}
}
This paper presents a methodology for illumination optics tolerancing. Specifically, we investigate tolerancing deformation of a single freeform surface under a point source illumination. Through investigation, we recognized and report here three surface-deformation characteristics that build tolerancing intuitions. First, we show that positive and negative irradiance changes occur together as a consequence of flux conservation. Then, we demonstrate a linear relationship between the steepness of the surface perturbation and the magnitude of the irradiance change. Lastly, we show that the Laplacian magic mirror concept (M. V. Berry [Eur. J. Phys. 27, 109 (2006)) can be expanded to surface deformation tolerancing. Utilizing these surface deformation characteristics, we propose a fast and predictable tolerancing method for a sequential illumination
Shadalou, Shohreh; Cassarly, William J.; Suleski, Thomas J.
Tunable LED-based illuminator using freeform arrays Proceedings
2021, (Proc. SPIE 12078, International Optical Design Conference 2021, 120780I ).
Abstract | Links | BibTeX | Tags: CeFO, CeFO design, freeform, Illumination
@proceedings{Shadalou2021_1,
title = {Tunable LED-based illuminator using freeform arrays},
author = {Shohreh Shadalou and William J. Cassarly and Thomas J. Suleski},
editor = {SPIE },
url = {https://opg.optica.org/abstract.cfm?uri=iodc-2021-120780I&origin=search},
doi = {doi: 10.1117/12.2603627},
year = {2021},
date = {2021-11-19},
urldate = {2021-11-19},
abstract = {We present a tunable LED-based illuminator using custom arrays of Alvarez lenses with commercially available secondary optics. Design methods and characterization of the system performance are discussed.},
note = {Proc. SPIE 12078, International Optical Design Conference 2021, 120780I },
keywords = {CeFO, CeFO design, freeform, Illumination},
pubstate = {published},
tppubtype = {proceedings}
}
We present a tunable LED-based illuminator using custom arrays of Alvarez lenses with commercially available secondary optics. Design methods and characterization of the system performance are discussed.
Kim, W.; Cassarly, W. J.; Rolland, J. P.
Applying Laplacian magic mirror in freeform illumination optics tolerancing Proceedings
SPIE Proceedings Vol. 11874, Illumination Optics VI 118740P , 2021.
Links | BibTeX | Tags: CeFO, Illumination
@proceedings{kim_spie_illum21,
title = {Applying Laplacian magic mirror in freeform illumination optics tolerancing},
author = {W. Kim and W. J. Cassarly and J. P. Rolland},
doi = {https://doi.org/10.1117/12.2596898},
year = {2021},
date = {2021-09-13},
howpublished = {SPIE Proceedings Vol. 11874, Illumination Optics VI 118740P },
keywords = {CeFO, Illumination},
pubstate = {published},
tppubtype = {proceedings}
}
Shadalou, Shohreh; Suleski, Thomas J.
Freeform arrays for dynamically tunable illumination systems Presentation
ASPE Spring Topical Meeting: Freeform and Structured Surfaces, 28.04.2021.
BibTeX | Tags: CeFO, Illumination
@misc{Shadalou2021_4,
title = {Freeform arrays for dynamically tunable illumination systems},
author = {Shohreh Shadalou and Thomas J. Suleski},
year = {2021},
date = {2021-04-28},
urldate = {2021-04-28},
howpublished = {ASPE Spring Topical Meeting: Freeform and Structured Surfaces},
keywords = {CeFO, Illumination},
pubstate = {published},
tppubtype = {presentation}
}
Shadalou, Shohreh; Cassarly, William J.; Suleski, Thomas J.
Tunable illumination for LED-based systems using refractive freeform arrays Journal Article
In: Optics Express, vol. 29, no. 22, pp. 35755-35764, 2021.
Abstract | Links | BibTeX | Tags: CeFO, CeFO design, freeform, Illumination
@article{Shadalou2021_3,
title = {Tunable illumination for LED-based systems using refractive freeform arrays},
author = {Shohreh Shadalou and William J. Cassarly and Thomas J. Suleski},
url = {https://doi.org/10.1364/OE.441304},
doi = {10.1364/OE.441304},
year = {2021},
date = {2021-00-00},
urldate = {2021-00-00},
journal = {Optics Express},
volume = {29},
number = {22},
pages = {35755-35764},
abstract = {Tunable illumination with high uniformity can improve functionality for multiple application areas. In lighting applications, dynamic illumination has been achieved by applying axial movement to the source(s) or other optical elements, resulting in poor uniformity, or using a liquid lens that adds design complexity. Advances in high-precision manufacturing methods have facilitated the practical implementation of freeform optical components, enabling new design approaches for illumination systems. This paper explores the use of arrays of varifocal transmissive freeform Alvarez lenses for an LED-based illumination system. The design is initialized using paraxial geometrical optics concepts and then refined for a 1mm-by−1 mm white LED source through a multi-step optimization. Design procedures are discussed, and simulation results are presented for an example illumination system that varies from a small circular spot mode to a large square uniform flood mode through millimeter-scale lateral translation between the Alvarez lens arrays.},
keywords = {CeFO, CeFO design, freeform, Illumination},
pubstate = {published},
tppubtype = {article}
}
Tunable illumination with high uniformity can improve functionality for multiple application areas. In lighting applications, dynamic illumination has been achieved by applying axial movement to the source(s) or other optical elements, resulting in poor uniformity, or using a liquid lens that adds design complexity. Advances in high-precision manufacturing methods have facilitated the practical implementation of freeform optical components, enabling new design approaches for illumination systems. This paper explores the use of arrays of varifocal transmissive freeform Alvarez lenses for an LED-based illumination system. The design is initialized using paraxial geometrical optics concepts and then refined for a 1mm-by−1 mm white LED source through a multi-step optimization. Design procedures are discussed, and simulation results are presented for an example illumination system that varies from a small circular spot mode to a large square uniform flood mode through millimeter-scale lateral translation between the Alvarez lens arrays.
2020
Shadalou, S.; Suleski, T. J.
Freeform optics for dynamic illumination Proceedings
vol. Proc. SPIE 11495, no. 114950B, 2020.
Links | BibTeX | Tags: CeFO, CeFO design, Illumination
@proceedings{Shadalou2020a,
title = {Freeform optics for dynamic illumination},
author = {S. Shadalou and T. J. Suleski},
editor = {SPIE},
url = {https://doi.org/10.1117/12.2568785},
doi = {10.1117/12.2568785},
year = {2020},
date = {2020-08-20},
volume = {Proc. SPIE 11495},
number = {114950B},
keywords = {CeFO, CeFO design, Illumination},
pubstate = {published},
tppubtype = {proceedings}
}