The Keck-I Cassegrain ADC

Andrew C. Phillips; Joseph Miller; David Cowley; Vernon Wallace

doi:10.1117/12.789930

11 July 2008 The Keck-I Cassegrain ADC

Andrew C. Phillips, Joseph Miller, David Cowley, Vernon Wallace

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 701453 (2008) https://doi.org/10.1117/12.789930
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

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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