@inproceedings{3deea1013d7d470486ba008fdc044438,
title = "Optical field/pupil rotator with a novel compact K-mirror for MagAO-X",
abstract = "The Magellan Extreme Adaptive Optics (MagAO-X) is a visible-wavelength adaptive optics (AO) instrument optimized for visible light coronagraphy and exoplanet imaging with the 6.5-m Magellan Clay telescope in Chile. Extremely large telescopes such as the future Giant Magellan Telescope (GMT) will be able to image earth-like exoplanets, given an extreme AO system - such as MagAO-X - exists. MagAO-X is now under development in the lab and undergoing final integration and testing. Technical first light is planned for early 2019, with final commissioning in late 2020. A crucial component to MagAO-X is the {"}K-mirror,{"} a 3-mirror system designed to rotate the optical field with minimal image wobble or distortion about the optical axis. The K-mirror rotates on a miniature motorized stage to stabilize the pupil in the coronagraph as the telescope tracks the sky. The optical design of MagAO-X required a very compact K-mirror, resulting in a challenging opto-mechanical mount design. We present a novel solution to the compact design of a 50mm max envelope K-mirror for MagAO-X that consists of three < 1-in diameter flat mirrors, all precision glued in place. The K-mirror mount was designed in Autodesk{\textregistered} Fusion 360{\texttrademark} and a prototype was built in the Steward Observatory machine shop. Using inexpensive COTS mirrors, the K-mirror prototype was tested, aligned, and glued with optical feedback in the lab. Once the prototype had proven successful, a final K-mirror mount was fabricated and assembled with invar and precision (0.1nm rms surface roughness, super polished, λ/40 PV flat) mirrors to develop a compact Kmirror for MagAO-X. The performance of the final hardware is presented here.",
keywords = "AO, K-mirror, adaptive optics, exoplanets, extreme, pupil rotator",
author = "Hedglen, {Alexander D.} and Close, {Laird M.} and Males, {Jared R.} and Olivier Durney",
note = "Funding Information: MagAO-X could not have been possible without support from the NSF{\textquoteright}s major research infrastructure (MRI) research grant #1625441 Development of a Visible Wavelength Extreme Adaptive Optics Coronagraphic Imager for the 6.5 meter Magellan Telescope (PI: Jared Males) and the NSF AAG program #1615408 The First Census of Accreting Protoplanets Inside the Gaps of Transitional Dust Disks (PI: Laird Close). Publisher Copyright: {\textcopyright} 2018 SPIE.; Adaptive Optics Systems VI 2018 ; Conference date: 10-06-2018 Through 15-06-2018",
year = "2018",
doi = "10.1117/12.2312346",
language = "English (US)",
isbn = "9781510619593",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Dirk Schmidt and Laura Schreiber and Close, {Laird M.}",
booktitle = "Adaptive Optics Systems VI",
}