16 September 2011 A 260 megapixel visible/NIR mixed technology focal plane for space
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Abstract
Mission concepts for NASA's Wide Field Infrared Survey Telescope (WFIRST)1,2, ESA's Euclid3,4 mission, as well as next-generation ground-based surveys require large mosaic focal planes sensitive in both visible and near infrared (NIR) wavelengths. We have developed space-qualified detectors, readout electronics and focal plane design techniques that can be used to intermingle CCDs and NIR detectors on a single, silicon carbide (SiC) cold plate. This enables optimized, wideband observing strategies. The CCDs, developed at Lawrence Berkeley National Laboratory, are fully-depleted, pchannel devices that are backside illuminated and capable of operating at temperatures down to 120K. The NIR detectors are 1.7 μm and 2.0 μm wavelength cutoff H2RG® HgCdTe, manufactured by Teledyne Imaging Sensors under contract to LBNL. Both the CCDs and NIR detectors are packaged on 4-side abuttable SiC pedestals with a common mounting footprint supporting a 44 mm mosaic pitch. Both types of detectors have direct-attached readout electronics that convert the detector signal directly to serial, digital data streams and allow a flexible, low cost data acquisition strategy to enable large data rates. A mosaic of these detectors can be operated at a common temperature that achieves the required dark current and read noise performance necessary for dark energy observations. We report here the qualification testing and performance verification for a focal plane that accommodates a 4x8 array of CCDs and HgCdTe detectors.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert W. Besuner, Robert W. Besuner, Christopher J. Bebek, Christopher J. Bebek, Gunther M. Haller, Gunther M. Haller, Stewart E. Harris, Stewart E. Harris, Philip A. Hart, Philip A. Hart, Henry D. Heetderks, Henry D. Heetderks, Patrick N. Jelinsky, Patrick N. Jelinsky, Michael L. Lampton, Michael L. Lampton, Michael E. Levi, Michael E. Levi, Sergio E. Maldonado, Sergio E. Maldonado, Natalie A. Roe, Natalie A. Roe, Aaron J. Roodman, Aaron J. Roodman, Leonid Sapozhnikov, Leonid Sapozhnikov, } "A 260 megapixel visible/NIR mixed technology focal plane for space", Proc. SPIE 8155, Infrared Sensors, Devices, and Applications; and Single Photon Imaging II, 81550D (16 September 2011); doi: 10.1117/12.893777; https://doi.org/10.1117/12.893777
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