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6 July 2018 HgCdTe SAPHIRA arrays: individual pixel measurement of charge gain and node capacitance utilizing a stable IR LED
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Abstract
We have relayed an extremely stable 1.7µm LED through a cryogenic integrating sphere to uniformly illuminate Leonardo SAPHIRA 320x256 arrays. This has enabled us to determine parameters such as charge gain, voltage gain, and node capacitance as a function of avalanche gain for individual pixels in a centered 64 x 64 pixel sub-array, and our results are reported here. We collected multiple sequences of one hundred 320-frame ramps over a variety of timescales and used them for several analyses. These measurements demonstrate that the intensity of the IR LED source is linear with current and stable to 0.1% over periods of an hour and from day to day, while the data cubes additionally allow determination of charge gain (in e􀀀/ADU) for each pixel. We have separately determined voltage gain (in e-/ADU), and together these yield node capacitance for each pixel. We have repeated these measurements at bias voltages ranging from 1 V (corresponding to unity gain, i.e. negligible avalanche gain) to 10.5 V (corresponding to an avalanche gain of 12.43 and the full onset of tunnel-tunnel current). These measurements are used to determine avalanche gain as a function of avalanche bias voltage, which becomes critical at bias voltages up to 10.5 V bias as dark current is low and junction capacitance varies.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Izabella Pastrana, Sean B Goebel, Donald N. B. Hall, and Shane M. Jacobson "HgCdTe SAPHIRA arrays: individual pixel measurement of charge gain and node capacitance utilizing a stable IR LED", Proc. SPIE 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII, 1070911 (6 July 2018); https://doi.org/10.1117/12.2312843
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