The Keck-I Cassegrain ADC

Details The Keck-I Cassegrain ADC The Keck-I Cassegrain ADC

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7014e.168p&link_type=abstract

Ground-based and Airborne Instrumentation for Astronomy II. Edited by McLean, Ian S.; Casali, Mark M. Proceedings of the SPI

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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.

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