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LOFT, LARGE OPTICS FABRICATION AND TESTING GROUP WITH OEFF & RFCML

Developing advanced technologies for optical testing and fabrication of large
optical components and systems.

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Large Optics Fabrication and Testing Group

The LOFT research group (Large Optics Fabrication and Testing) led by Prof.
Daewook Kim consists of research faculty, staff, and students dedicated to
developing advanced technologies for optical testing and fabrication of large
optical components and systems. LOFT research is closely tied to hardware
projects at the Optical Engineering and Fabrication Facility (OEFF) at the
College of Optical Sciences and the Richard F. Caris Mirror Lab (RFCML). The
intersection of basic research and production driven projects provides LOFT
faculty and students the ability to efficiently take technical solutions from
concept to prototype to full scale implementation. Likewise the implementation
of advanced technologies allows OEFF and RFCML to build new classes of optical
components and systems. LOFT students and faculty make significant contributions
to new astronomical telescopes and advanced optical instruments.

Daewook Kim and Heejoo Choi, LOFT group PI and Co-PI

Optical Engineering and Fabrication Facility / Richard F. Caris Mirror Lab

The Optical Engineering and Fabrication Facility (OEFF) is headed by Jeff
Kingsley (Director) / Chang-jin Oh (Technical Director) and is comprised of a
research staff specializing in the manufacture, test and assembly of unique
optical and optomechanical systems up to 6.5-meters in diameter. The OEFF
originated as the Optics Shop in the early 1970’s as part of the vision of
Professor Aden Meinel for the Optical Sciences Center to provide pioneering
research in the field of optical engineering. This facility has grown
substantially over the years, providing engineering and fabrication resources to
the College of Optical Sciences faculty to carry out their research.

The OEFF has state of the art optical fabrication and testing equipment. We have
built three robotic grinding and polishing machines, capable of manufacturing
on-axis and off-axis aspheres, concave or convex up to 1.8-meters in diameter.
We have designed and built these machines with in-situ metrology systems that
enable us to test components during both grinding and polishing phases, with
accuracies approaching several nm rms. We have also built a 6.5-meter capacity
computer controlled grinder and polisher, which is positioned under our 35-meter
vertical test tower. This allows us to perform optical tests on a wide variety
of parts without moving the part off of the machine. We have several
simultaneous phase shifting interferometers, both Twyman Green and Fizeau types,
and also have two laser tracker systems, which we use for precision alignment of
optics and optomechanical assemblies. OEFF completed the next generation solar
telescope, the 4.2 m Daniel K. Inouye Solar Telescope (DKIST), primary mirror
made out of Zerodur in 2016.

The Richard F. Caris Mirror Lab headed by Buell Jannuzi (Steward Observatory
Director), Jeff Kingsley (Associate Director), and Roger Angel (Director) is
part of the Astronomy Department at the University of Arizona. It was built to
make telescope mirrors that offer superior performance and that could not be
obtained commercially. The primary advantage of these mirrors is their
lightweight honeycomb structure with a mass only 1/5 that of a sold mirror of
the same dimensions. These mirrors hold their shape under forces of gravity and
wind, and minimize thermal effects by closely following the changing air
temperature. A number of large telescopes have been designed to use the
honeycomb mirrors. The Mirror Lab’s ability to supply them makes it possible for
the university to be a partner in some of the world’s most powerful telescopes,
including the 2 × 8.4 m Large Binocular Telescope (LBT), the 8.4 m Large
Synoptic Survey Telescope (LSST) and the 25 m Giant Magellan Telescope (GMT).

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