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11 July 2008 The Keck-I Cassegrain ADC
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Abstract
We briefly describe the design, construction and performance of the recently-commissioned Atmospheric Dispersion Corrector (ADC) for the Keck-I Cassegrain focus. This is a "longitudinal" ADC with fused silica prisms slightly over 1- meter in diameter, designed to operate at zenith distances up to 60 degrees and over a 20 arcminute field-of-view with negligible impact on image quality and throughput. It provides dispersion compensation from 0.31 to 1.1 microns. The sol-gel-based antireflection coatings were a major technological challenge, and we encountered some previously unrecognized performance consequences of the LADC design which should be considered before adopting this design.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrew C. Phillips, Joseph Miller, David Cowley, and Vernon Wallace "The Keck-I Cassegrain ADC", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701453 (11 July 2008); https://doi.org/10.1117/12.789930
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