First laboratory and on-sky results of an adaptive secondary mirror with TNO-style actuators on the NASA Infrared Telescope Facility

Ellen Lee; Mark Chun; Olivier Lai; Ruihan Zhang; Max Baeten; Arjo Bos; Matias Kidron; Fred Kamphues; Stefan Kuiper; Wouter Jonker; Michael Connelley; John Rayner; Alan Ryan; Philip Hinz; Rachel Bowens-Rubin; Charles Lockhart; Michael Kelii

doi:10.1117/12.3016132

27 August 2024 First laboratory and on-sky results of an adaptive secondary mirror with TNO-style actuators on the NASA Infrared Telescope Facility

Ellen Lee, Mark Chun, Olivier Lai, Ruihan Zhang, Max Baeten, Arjo Bos, Matias Kidron, Fred Kamphues, Stefan Kuiper, Wouter Jonker, Michael Connelley, John Rayner, Alan Ryan, Philip Hinz, Rachel Bowens-Rubin, Charles Lockhart, Michael Kelii

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130972P (2024) https://doi.org/10.1117/12.3016132
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

We are developing an adaptive secondary mirror (ASM) that uses a new actuator technology created by the Netherlands Organization for Applied Scientific Research (TNO). The TNO hybrid variable reluctance actuators have more than an order of magnitude better efficiency over the traditional voice coil actuators that have been used on existing ASMs and show potential for improving the long-term robustness and reliability of ASMs. To demonstrate the performance, operations, and serviceability of TNO’s actuators in an observatory, we have developed a 36-actuator prototype ASM for the NASA Infrared Telescope Facility (IRTF) called IRTF-ASM-1. IRTF-ASM-1 provides the first on-sky demonstration of this approach and will help us evaluate the long-term performance and use of this technology in an astronomical facility environment. We present calibration and performance results with the ASM in a Meniscus Hindle Sphere lens setup as well as preliminary on-sky results on IRTF. IRTF-ASM-1 achieved stable closed-loop performance on-sky with H-band Strehl ratios of 35-40% in long-exposure images under a variety of seeing conditions.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Ellen Lee, Mark Chun, Olivier Lai, Ruihan Zhang, Max Baeten, Arjo Bos, Matias Kidron, Fred Kamphues, Stefan Kuiper, Wouter Jonker, Michael Connelley, John Rayner, Alan Ryan, Philip Hinz, Rachel Bowens-Rubin, Charles Lockhart, and Michael Kelii "First laboratory and on-sky results of an adaptive secondary mirror with TNO-style actuators on the NASA Infrared Telescope Facility", Proc. SPIE 13097, Adaptive Optics Systems IX, 130972P (27 August 2024); https://doi.org/10.1117/12.3016132

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