23 July 2014 Near-infrared InGaAs detectors for background-limited imaging and photometry
Author Affiliations +
Originally designed for night-vision equipment, InGaAs detectors are beginning to achieve background-limited performance in broadband imaging from the ground. The lower cost of these detectors can enable multi-band instruments, arrays of small telescopes, and large focal planes that would be uneconomical with high-performance HgCdTe detectors. We developed a camera to operate the FLIR AP1121 sensor using deep thermoelectric cooling and up-the-ramp sampling to minimize noise. We measured a dark current of 163 e- s-1 pix-1, a read noise of 87 e- up-the-ramp, and a well depth of 80k e-. Laboratory photometric testing achieved a stability of 230 ppm hr-1/2, which would be required for detecting exoplanet transits. InGaAs detectors are also applicable to other branches of near-infrared time-domain astronomy, ranging from brown dwarf weather to gravitational wave follow-up.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter W. Sullivan, Peter W. Sullivan, Bryce Croll, Bryce Croll, Robert A. Simcoe, Robert A. Simcoe, "Near-infrared InGaAs detectors for background-limited imaging and photometry", Proc. SPIE 9154, High Energy, Optical, and Infrared Detectors for Astronomy VI, 91541F (23 July 2014); doi: 10.1117/12.2056425; https://doi.org/10.1117/12.2056425


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