Infrared on-detector guide-windows in the era of extremely large telescopes

Edward L. Chapin; Jennifer Dunn; Tim Hardy; Owen Hubner; Jordan Lothrop

doi:10.1117/12.2627979

29 August 2022 Infrared on-detector guide-windows in the era of extremely large telescopes

Edward L. Chapin, Jennifer Dunn, Tim Hardy, Owen Hubner, Jordan Lothrop

Proceedings Volume 12191, X-Ray, Optical, and Infrared Detectors for Astronomy X; 121910R (2022) https://doi.org/10.1117/12.2627979
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

Future Extremely Large Telescopes (ELTs) will require advances in Adaptive Optics (AO) systems to fully realize their potential. In addition to separate, dedicated wavefront sensors, it is recognized that wavefront sensing within the science focal plane itself will also be needed for many new instruments. One approach is to use On-Detector Guide Windows (ODGWs), whereby a small sub-window of a science detector is read-out continuously (~10s-100s of Hz) in parallel with slower reads of the full chip (>10 s). Guide star centroids from these windows can be used to correct for vibrations and flexure. Another potential use for these windows is to perform localized resets at high cadence to prevent saturation and to minimize persistence from bright sources. We have prototyped an ODGW system using a 5-μm cutoff Teledyne HAWAII-2RG infrared detector, and the new Astronomical Research Cameras Gen-4 controller. We describe our implementation of an ODGW mode, and science image artifacts that were observed.

Conference Presentation

Citation Download Citation

Edward L. Chapin, Jennifer Dunn, Tim Hardy, Owen Hubner, and Jordan Lothrop "Infrared on-detector guide-windows in the era of extremely large telescopes", Proc. SPIE 12191, X-Ray, Optical, and Infrared Detectors for Astronomy X, 121910R (29 August 2022); https://doi.org/10.1117/12.2627979

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