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Proceedings Paper

Status update and closed-loop performance of the Magellan adaptive optics VisAO camera
Author(s): Derek Kopon; Laird M. Close; Jared Males; Victor Gasho; Katie Morzinski; Katherine Follette
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Paper Abstract

We present laboratory results of the closed-loop performance of the Magellan Adaptive Optics (AO) Adaptive Secondary Mirror (ASM), pyramid wavefront sensor (PWFS), and VisAO visible adaptive optics camera. The Magellan AO system is a 585-actuator low-emissivity high-throughput system scheduled for first light on the 6.5 meter Magellan Clay telescope in November 2012. Using a dichroic beamsplitter near the telescope focal plane, the AO system will be able to simultaneously perform visible (500-1000 nm) AO science with our VisAO camera and either 10 μm or 3-5 μm science using either the BLINC/MIRAC4 or CLIO cameras, respectively. The ASM, PWS, and VisAO camera have undergone final system tests in the solar test tower at the Arcetri Institute in Florence, Italy, reaching Strehls of 37% in i'-band with 400 modes and simulated turbulence of 14 cm ro at v-band. We present images and test results of the assembled VisAO system, which includes our prototype advanced Atmospheric Dispersion Corrector (ADC), prototype calcite Wollaston prisms for SDI imaging, and a suite of beamsplitters, filters, and other optics. Our advanced ADC performs in the lab as designed and is a 58% improvement over conventional ADC designs. We also present images and results of our unique Calibration Return Optic (CRO) test system and the ASM, which has successfully run in closedloop at 1kHz. The CRO test is a retro reflecting optical test that allows us to test the ASM off-sky in close-loop using an artificial star formed by a fiber source.

Paper Details

Date Published: 13 September 2012
PDF: 15 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84473D (13 September 2012); doi: 10.1117/12.926446
Show Author Affiliations
Derek Kopon, Steward Observatory, The Univ. of Arizona (United States)
Laird M. Close, Steward Observatory, The Univ. of Arizona (United States)
Jared Males, Steward Observatory, The Univ. of Arizona (United States)
Victor Gasho, Steward Observatory, The Univ. of Arizona (United States)
Katie Morzinski, Steward Observatory, The Univ. of Arizona (United States)
Katherine Follette, Steward Observatory, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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