Cold-stop and lyot stop designs for a new InfraredExoplanet Imager at Keck Observatory

Jialin Li; Andy Skemer

doi:10.1117/12.2594317

1 September 2021 Cold-stop and lyot stop designs for a new InfraredExoplanet Imager at Keck Observatory

Jialin Li, Andy Skemer

Proceedings Volume 11823, Techniques and Instrumentation for Detection of Exoplanets X; 118231V (2021) https://doi.org/10.1117/12.2594317
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Conference Poster

Abstract

Santa Cruz Array of Lenslets for Exoplanet Spectroscopy (SCALES) is an instrument being designed for direct imaging of exoplanets in the mid-infrared with the Adaptive Optics System of the W.M. Keck Observatory. The performance of SCALES will be largely affected by thermal emission from the instrument structures. Placement of a pupil stop can limit the emission of instrument structures such as primary mirror segment gaps, secondary structures, and spider arms. Here we proposed a cold stop design of a circular inner mask paired with a serrated outer mask. Taking into account the pupil nutation, we modeled the throughput and the background emission for the design to optimize the dimensions of the cold stop.

Citation Download Citation

Jialin Li and Andy Skemer "Cold-stop and lyot stop designs for a new InfraredExoplanet Imager at Keck Observatory", Proc. SPIE 11823, Techniques and Instrumentation for Detection of Exoplanets X, 118231V (1 September 2021); https://doi.org/10.1117/12.2594317

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