Low pitch LWIR QWIPs: Performance level and image quality |
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| Institution: | 1. Center for Photonics Innovation, Arizona State University, Tempe, AZ, 85287, USA;2. School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, AZ, 85287, USA;3. School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, AZ, 85287, USA;4. Air Force Research Laboratory, Space Vehicles Directorate RVSWS, Kirtland Air Force Base, Albuquerque, NM, USA;5. Applied Technology Associates, Albuquerque, NM, USA;1. Solid State Physics Laboratory, Lucknow Road, Delhi 110054, India;2. Defence Metallurgical Laboratory, Kanchanbagh, Hyderabad 500058, India;1. PARADISE Research Laboratory, University of Ottawa, Ottawa, Canada;2. Department of Computer Science, Kuwait University, Kuwait;3. Federal University of Minas Gerais, Belo Horizonte, MG, Brazil |
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| Abstract: | We present recent results obtained on 15 μm pitch LWIR QWIP arrays at Sofradir. Based on experimental data gathered on several QWIP wafers, the performance (NETD) at the system level has been estimated. We show that, in spite of the small pitch, values as low as 50 mK can be achieved for rather closed optical systems (f/2.5) and for operating temperatures (74 K) compatible with available compact cryo-coolers.We also demonstrate that specific pixel configurations can be designed to investigate the pixel-to-pixel optical crosstalk. Such measurements can help to better understand the limitations set by the geometry of the pixel on the Modulation Transfer Function (MTF). In particular, we show that the optical crosstalk due to photon transfer through the inter-pixel space is rather small for unthinned devices. |
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| Keywords: | QWIP Infrared Low pitch LWIR |
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