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HgCdTe SAPHIRA arrays: individual pixel measurement of charge gain and node capacitance utilizing a stable IR LED
Author(s): Izabella Pastrana; Sean B Goebel; Donald N. B. Hall; Shane M. Jacobson
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Paper 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.

Paper Details

Date Published: 6 July 2018
PDF: 15 pages
Proc. SPIE 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII, 1070911 (6 July 2018); doi: 10.1117/12.2312843
Show Author Affiliations
Izabella Pastrana, Washington Univ. in St. Louis (United States)
Sean B Goebel, Institute for Astronomy, Univ. of Hawai'i (United States)
Subaru Telescope, National Astronomical Observatory of Japan (United States)
Donald N. B. Hall, Institute for Astronomy, Univ. of Hawai'i (United States)
Shane M. Jacobson, Institute for Astronomy, Univ. of Hawai'i (United States)


Published in SPIE Proceedings Vol. 10709:
High Energy, Optical, and Infrared Detectors for Astronomy VIII
Andrew D. Holland; James Beletic, Editor(s)

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