An atmospheric dispersion corrector design with milliarcsecond-level precision from 1 to 4 microns for high dispersion coronagraphy

Jason J. Wang; J. Kent Wallace; Nemanja Jovanovic; Olivier Guyon; Mitsuko Roberts; Dimitri Mawet

doi:10.1117/12.2562654

13 December 2020 An atmospheric dispersion corrector design with milliarcsecond-level precision from 1 to 4 microns for high dispersion coronagraphy

Jason J. Wang, J. Kent Wallace, Nemanja Jovanovic, Olivier Guyon, Mitsuko Roberts, Dimitri Mawet

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 1144754 (2020) https://doi.org/10.1117/12.2562654
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Differential atmospheric refraction (DAR) limits the amount of light that can be coupled into a single mode fiber and provides additional complications for any fiber tracking system. We present an atmospheric dispersion corrector (ADC) design based off of two counter-rotating prisms to fit the needs of exoplanet spectroscopy for the Keck Planet Imager and Characterizer (KPIC) from 1.1 to 4.2 microns. Due to strong telluric effects, we find that the default Zemax prescription for DAR between 2 and 4.2 microns to be inaccurate up to 15 mas when comparing against DAR models computed from first principles. Using first-principle models, we developed our own custom ADC optimization solution and achieve less than 4 mas residual dispersion in any individual science band (J, K, L) down to 60 degree zenith angles, while the whole time maintaining less than 3 mas of residual dispersion in the tracking band (H) and less than 2 mas of residual dispersion between the tracking and science bands.

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Jason J. Wang, J. Kent Wallace, Nemanja Jovanovic, Olivier Guyon, Mitsuko Roberts, and Dimitri Mawet "An atmospheric dispersion corrector design with milliarcsecond-level precision from 1 to 4 microns for high dispersion coronagraphy", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144754 (13 December 2020); https://doi.org/10.1117/12.2562654

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