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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 693651.0, MPI für Astronomie / Publikationen_mpia
Design, implementation, and on-sky performance of an advanced apochromatic triplet atmospheric dispersion corrector for the Magellan Adaptive Optics system and VisAO camera
Authors:Kopon, D.; Close, L. M.; Males, J. R.; Gasho, V.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Publications of the Astronomical Society of the Pacific
Volume:125
Issue / Number:930
Start Page:966
End Page:975
Audience:Not Specified
Abstract / Description:We present the novel design, laboratory verification, and on-sky performance of our advanced triplet atmospheric dispersion corrector (ADC), an important component of the Magellan Adaptive Optics system (MagAO), which recently achieved first light in December 2012. High-precision broadband (0.5--1.0 μm) atmospheric dispersion correction at visible wavelengths is essential both for wavefront sensing (WFS) on fainter guide stars, and for performing visible AO science using our VisAO science camera. At 2 airmasses (60° from zenith) and over the waveband 500--1000 nm, our triplet design produces a 57% improvement in geometric rms spot size, a 33% improvement in encircled energy at 20″ radius, and a 62% improvement in Strehl ratio when compared to a conventional doublet design. This triplet design has been fabricated, tested in the lab, and integrated into the MagAO WFS and the VisAO science camera. We present on-sky results of the ADC in operation with the MagAO system. We also present a zero-beam-deviation triplet ADC design, which will be important to future AO systems that require precise alignment of the optical axis over a large range of airmasses in addition to diffraction-limited broadband dispersion correction.
Free Keywords:Astronomical Instrumentation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6280
URL:http://cdsads.u-strasbg.fr/abs/2013PASP..125..966K
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