Characterization of a longwave HgCdTe GeoSnap detector

Rory Bowens; Michael R. Meyer; Taylor L. Tobin; Eric Viges; Dennis Hart; John Monnier; Jarron Leisenring; Derek Ives; Roy van Boekel

doi:10.1117/12.3018499

27 August 2024 Characterization of a longwave HgCdTe GeoSnap detector

Rory Bowens, Michael R. Meyer, Taylor L. Tobin, Eric Viges, Dennis Hart, John Monnier, Jarron Leisenring, Derek Ives, Roy van Boekel

Author Affiliations +

Proceedings Volume 13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI; 1310325 (2024) https://doi.org/10.1117/12.3018499
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

New longwave HgCdTe detectors are critical to upcoming plans for ground-based infrared astronomy. These detectors, with fast-readouts and deep well-depths, will be key components of extremely large telescope instruments and therefore must be well understood prior to deployment. We analyze one such HgCdTe detector, a Teledyne Imaging Sensors GeoSnap, at the University of Michigan. We find that the properties of the GeoSnap are consistent with expectations from analysis of past devices. The GeoSnap has a well-depth of 2.75 million electrons per pixel, a read noise of 360e-/pix, and a dark current of 330,000 e-/s/pix at 45K. The device experiences 1/f noise which can be mitigated relative to half-well shot noise with modest frequency image differencing. The GeoSnap’s quantum efficiency is calculated to be 79.7 ± 8.3% at 10.6 microns. Although the GeoSnap’s bad pixel fraction, on the order of 3%, is consistent with other GeoSnap devices, close to a third of the bad pixels in this detector are clustered in a series of 31 ”leopard” spots spread across the detector plane. We report these properties and identify additional analyses that will be performed on future GeoSnap detectors.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Rory Bowens, Michael R. Meyer, Taylor L. Tobin, Eric Viges, Dennis Hart, John Monnier, Jarron Leisenring, Derek Ives, and Roy van Boekel "Characterization of a longwave HgCdTe GeoSnap detector", Proc. SPIE 13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI, 1310325 (27 August 2024); https://doi.org/10.1117/12.3018499

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