Author
Taylor, J.Sivanandam, S.
Anugu, N.
Butko, A.
Chen, S.
Durney, O.
Hardy, T.
Lamb, M.
Montoya, M.
Morzinski, K.
Swanson, R.
Affiliation
Steward Observatory, University of ArizonaIssue Date
2022-08-29Keywords
Adaptive opticsavalanche photodiode array
MAPS
MMT Observatory
near infrared
pyramid wavefront sensor
SAPHIRA
Metadata
Show full item recordPublisher
SPIECitation
Jacob Taylor, Suresh Sivanandam, Narsireddy Anugu, Adam Butko, Shaojie Chen, Olivier Durney, Tim Hardy, Masen Lamb, Manny Montoya, Katie Morzinski, Robin Swanson, "A near-infrared pyramid wavefront sensor for the MMT," Proc. SPIE 12185, Adaptive Optics Systems VIII, 121856R (29 August 2022); https://doi.org/10.1117/12.2629419Rights
© 2022 SPIE. (2022) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The MMTO Adaptive optics exoPlanet characterization System (MAPS) is an ongoing upgrade to the 6.5-meter MMT Observatory on Mount Hopkins in Arizona. MAPS includes an upgraded adaptive secondary mirror (ASM), upgrades to the ARIES spectrograph, and a new AO system containing both an optical and near-infrared (NIR; 0.9-1.8 µm) pyramid wavefront sensor (PyWFS). The NIR PyWFS will utilize an IR-optimized double pyramid coupled with a SAPHIRA detector: a low-read noise electron Avalanche Photodiode (eAPD) array. This NIR PyWFS will improve MAPS's sky coverage by an order of magnitude by allowing redder guide stars (e.g. K & M-dwarfs or highly obscured stars in the Galactic plane) to be used. To date, the custom designed cryogenic SAPHIRA camera has been fully characterized and can reach sub-electron read noise at high avalanche gain. In order to test the performance of the camera in a closed-loop environment prior to delivery to the observatory, an AO testbed was designed and constructed. In addition to testing the SAPHIRA's performance, the testbed will be used to test and further develop the proposed on-sky calibration procedure for MMTO's ASM. We will report on the anticipated performance improvements from our NIR PyWFS, the SAPHIRA's closed-loop performance on our testbed, and the status of our ASM calibration procedure. © 2022 SPIE.Note
Immediate accessISSN
0277-786XISBN
978-151065351-1Version
Final Published Versionae974a485f413a2113503eed53cd6c53
10.1117/12.2629419