NASA has turned to strained-layer super lattice (SLS) imagers for infra-red space cameras. They are based on earlier ‘quantum well infrared photodetectors’ (QWIPs) that are flying on Landsat 8, and will be flying Landsat 9, which monitor vegetation from space. SLS imaging arrays are fabricated on a semiconductor wafer, using hundreds of alternating epitaxially layers ...
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from Electronics Weekly https://www.electronicsweekly.com/market-sectors/military-aerospace-electronics/nasa-try-strained-layer-super-lattice-imagers-space-2018-08/
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