2021
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.
Nikolov, Daniel K.; Bauer, Aaron; Cheng, Fei; Kato, Hitoshi; Vamivakas, A. Nick; Rolland, Jannick P.
Metaform optics: Bridging nanophotonics and freeform optics Journal Article
In: Science Advances, vol. 7, no. 18, pp. eabe5112, 2021.
Abstract | Links | BibTeX | Tags: Aberration correction, augmented reality, CeFO manufacturing, CEFO metrology, freeform, head display, Image quality, Optical design, relay optics, rolland, tomography
@article{nokey,
title = {Metaform optics: Bridging nanophotonics and freeform optics},
author = {Daniel K. Nikolov and Aaron Bauer and Fei Cheng and Hitoshi Kato and A. Nick Vamivakas and Jannick P. Rolland},
url = {https://www.science.org/doi/abs/10.1126/sciadv.abe5112},
doi = {10.1126/sciadv.abe5112},
year = {2021},
date = {2021-04-30},
urldate = {2021-04-30},
journal = {Science Advances},
volume = {7},
number = {18},
pages = {eabe5112},
abstract = {The demand for high-resolution optical systems with a compact form factor, such as augmented reality displays, sensors, and mobile cameras, requires creating new optical component architectures. Advances in the design and fabrication of freeform optics and metasurfaces make them potential solutions to address the previous needs. Here, we introduce the concept of a metaform—an optical surface that integrates the combined benefits of a freeform optic and a metasurface into a single optical component. We experimentally realized a miniature imager using a metaform mirror. The mirror is fabricated via an enhanced electron beam lithography process on a freeform substrate. The design degrees of freedom enabled by a metaform will support a new generation of optical systems.},
keywords = {Aberration correction, augmented reality, CeFO manufacturing, CEFO metrology, freeform, head display, Image quality, Optical design, relay optics, rolland, tomography},
pubstate = {published},
tppubtype = {article}
}
The demand for high-resolution optical systems with a compact form factor, such as augmented reality displays, sensors, and mobile cameras, requires creating new optical component architectures. Advances in the design and fabrication of freeform optics and metasurfaces make them potential solutions to address the previous needs. Here, we introduce the concept of a metaform—an optical surface that integrates the combined benefits of a freeform optic and a metasurface into a single optical component. We experimentally realized a miniature imager using a metaform mirror. The mirror is fabricated via an enhanced electron beam lithography process on a freeform substrate. The design degrees of freedom enabled by a metaform will support a new generation of optical systems.
Di Xu, * Zhenkun Wen; Rolland, Jannick P.
Verification of cascade optical coherence tomography for freeform optics form metrology Journal Article
In: Optics Express, vol. 29, no. 6, pp. 8542-8552, 2021.
Abstract | Links | BibTeX | Tags: CeFO, CEFO metrology, coherence, freeform, tomography
@article{XU2021b,
title = {Verification of cascade optical coherence tomography for freeform optics form metrology},
author = {Di Xu,,* Zhenkun Wen, Andres Garcia Coleto, Michael
Pomerantz, John C. Lambropoulos, 2 and Jannick P.
Rolland},
url = {https://opg.optica.org/oe/fulltext.cfm?uri=oe-29-6-8542&id=448922},
doi = {https://doi.org/10.1364/OE.413844},
year = {2021},
date = {2021-03-05},
urldate = {2021-03-05},
journal = {Optics Express},
volume = {29},
number = {6},
pages = {8542-8552},
abstract = {Freeform optical components enable dramatic advances for optical systems in both
performance and packaging. Surface form metrology of manufactured freeform optics remains
a challenge and an active area of research. Towards addressing this challenge, we previously
reported on a novel architecture, cascade optical coherence tomography (C-OCT), which was
validated for its ability of high-precision sag measurement at a given point. Here, we demonstrate
freeform surface measurements, enabled by the development of a custom optical-relay-based
scanning mechanism and a unique high-speed rotation mechanism. Experimental results on a flat
mirror demonstrate an RMS flatness of 14 nm (∼λ/44 at the He-Ne wavelength). Measurement
on a freeform mirror is achieved with an RMS residual of 69 nm (∼λ/9). The system-level
investigations and validation provide the groundwork for advancing C-OCT as a viable freeform
metrology technique.
},
keywords = {CeFO, CEFO metrology, coherence, freeform, tomography},
pubstate = {published},
tppubtype = {article}
}
Freeform optical components enable dramatic advances for optical systems in both
performance and packaging. Surface form metrology of manufactured freeform optics remains
a challenge and an active area of research. Towards addressing this challenge, we previously
reported on a novel architecture, cascade optical coherence tomography (C-OCT), which was
validated for its ability of high-precision sag measurement at a given point. Here, we demonstrate
freeform surface measurements, enabled by the development of a custom optical-relay-based
scanning mechanism and a unique high-speed rotation mechanism. Experimental results on a flat
mirror demonstrate an RMS flatness of 14 nm (∼λ/44 at the He-Ne wavelength). Measurement
on a freeform mirror is achieved with an RMS residual of 69 nm (∼λ/9). The system-level
investigations and validation provide the groundwork for advancing C-OCT as a viable freeform
metrology technique.
performance and packaging. Surface form metrology of manufactured freeform optics remains
a challenge and an active area of research. Towards addressing this challenge, we previously
reported on a novel architecture, cascade optical coherence tomography (C-OCT), which was
validated for its ability of high-precision sag measurement at a given point. Here, we demonstrate
freeform surface measurements, enabled by the development of a custom optical-relay-based
scanning mechanism and a unique high-speed rotation mechanism. Experimental results on a flat
mirror demonstrate an RMS flatness of 14 nm (∼λ/44 at the He-Ne wavelength). Measurement
on a freeform mirror is achieved with an RMS residual of 69 nm (∼λ/9). The system-level
investigations and validation provide the groundwork for advancing C-OCT as a viable freeform
metrology technique.
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.