Status and first results of the NASA IRTF adaptive secondary mirror

Arjo Bos; Bert Dekker; Max Baeten; Stefan Kuiper; Matias Kidron; Esperanza Vielba Salcedo; Rafiek Vermeulen; Jan Kuijt; Kristian Boot; Bart van Venrooy; Robin van Buuren; Fred Kamphues; Wouter Jonker; Matthew Maniscalco; Mark R. Chun; Michael Connelley; Alan Ryan; Ellen Lee; Ruihan Zhang; Olivier Lai; Jeroen J. Vleggaar; Philip M. Hinz

doi:10.1117/12.3020085

26 August 2024 Status and first results of the NASA IRTF adaptive secondary mirror

Arjo Bos, Bert Dekker, Max Baeten, Stefan Kuiper, Matias Kidron, Esperanza Vielba Salcedo, Rafiek Vermeulen, Jan Kuijt, Kristian Boot, Bart van Venrooy, Robin van Buuren, Fred Kamphues, Wouter Jonker, Matthew Maniscalco, Mark R. Chun, Michael Connelley, Alan Ryan, Ellen Lee, Ruihan Zhang, Olivier Lai, Jeroen J. Vleggaar, Philip M. Hinz

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 1310013 (2024) https://doi.org/10.1117/12.3020085
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

TNO and partners at University of Hawai’i (UH), the NASA InfraRed Telescope Facility (IRTF), and the Center for Adaptive Optics (CfAO) at UCSC have been working on the realization of a 244 mm Adaptive Secondary Mirror (ASM) for the NASA IRTF called the IRTF-ASM-1. After successful performance testing of several laboratory prototypes, this project provided the first on-sky demonstration of TNO’s ASM technology at M2 location with an optically powered mirror shell.

The ASM is designed to retrofit the current passive M2. The ASM consists of a 244mm-diameter slumped convex aspherical mirror shell, manipulated by 36 hybrid variable reluctance actuators mounted on a light-weighted backing structure. The mirror shell is manufactured to the required accuracy at reduced cost through slumping by UCSC. The mirror shell is finished to final figure with Magnetorheological Finishing (MRF) by TNO before it was coated.

The ASM was shipped to UH in Hilo in February 2024, where performance was tested in the lab. The IRTF ASM saw ‘first light’ on telescope on the 23^rd of April, already achieving stable closed-loop performance that was diffraction limited at the H-band (1.62 microns) with a long-exposure Strehl ratio of 35%-40% in sub-arcsecond seeing during the first night.

This paper will report on the status and first results of the IRTF ASM, including the latest status of the deformable mirror technology at TNO and an outlook to a second generation IRTF ASM with improved dynamic performance and increased actuator count.

Conference Presentation

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

Citation Download Citation

Arjo Bos, Bert Dekker, Max Baeten, Stefan Kuiper, Matias Kidron, Esperanza Vielba Salcedo, Rafiek Vermeulen, Jan Kuijt, Kristian Boot, Bart van Venrooy, Robin van Buuren, Fred Kamphues, Wouter Jonker, Matthew Maniscalco, Mark R. Chun, Michael Connelley, Alan Ryan, Ellen Lee, Ruihan Zhang, Olivier Lai, Jeroen J. Vleggaar, and Philip M. Hinz "Status and first results of the NASA IRTF adaptive secondary mirror", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 1310013 (26 August 2024); https://doi.org/10.1117/12.3020085

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available