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\title{Science AMA Series: I'm Dr. Dae Wook Kim, and we are the Large Optics
Fabrication and Testing (LOFT) Group at the College of Optical Sciences.
We want to share our knowledge about the tools required to make and then
test the world's largest mirrors! AMA!}



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  \date{April 24, 2026}


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\begin{abstract}
Hello Reddit! We are excited to be here to share our expertise in the
field of fabrication and testing of mirrors and other optical surfaces.
Joining me (Dae Wook) in answering questions are my students Logan
Graves and Isaac Trumper, who specialize in developing these types of
measurement tools. We specialize in making very large telescopes of
world renowned quality. We can do this only through understanding
exactly how to make, and then test, the mirrored surfaces. You may have
heard of one of our current projects, the Giant Magellan Telescope
(GMT), but we like to call it a giant camera! This telescope is designed
to investigate events just after the Big Bang, such as how galaxies
formed. It will do an amazing job at collecting light in order to view
very faint objects in the sky. We also work on other exciting projects
such as a giant microscope (DKIST), and a giant action-cam (LSST).
Please take a look at our group's website to get an idea of the other
types of projects we work on:
http://www.loft.optics.arizona.edu/projects/. To enable these amazing
telescopes, we develop fabrication and testing methods such as using
silly putty to polish, or a TV and camera to display fun patterns to
measure nanometer sized surface defects. We even use really hot wires to
generate infrared radiation, which enables a whole different type of
surface testing. Want to learn how you can make your own mirrors?
Interested in amateur astronomy? Want to understand how optics and light
works more? Well then come on and ask us anything! We will be back at 6
pm ET to answer your questions, ask us anything! Edit: Hello Reddit, we
are live! Edit: Hello Reddit, we are leaving for now and will come back
later for some follow-ups if there are any more questions/comments. We
enjoyed it! Thank you.%
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