5 July 2000 Performance of new fringe-detecting avalanche photodiodes at COAST
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Abstract
At the Cambridge Optical Aperture Synthesis Telescope (COAST), first-generation photon counting avalanche photodiodes (APDs) have been used as the pupil-plane fringe detectors in the optical regime. These are being replaced with EG&G's super-low k (`SliK') APDs, which have an exceptionally low dark count (fewer than 100 counts per second) and high detection efficiency (up to 70% at 700 nm). The new detectors have increased the limiting magnitude of the telescope, enabling the observation of targets previously too faint to be seen. We shall discuss the operation of these devices at COAST and present new interferometric observations of stellar objects at visible magnitudes of eight and fainter.
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Amanda V. George, John E. Baldwin, Roger C. Boysen, Christopher A. Haniff, Craig D. Mackay, Debbie Pearson, John Rogers, Peter J. Warner, Donald M. A. Wilson, John S. Young, "Performance of new fringe-detecting avalanche photodiodes at COAST", Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390253; https://doi.org/10.1117/12.390253
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