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Proceedings Paper

Characterization of lambdac=5 um Hg:Cd:Te arrays for low-background astronomy
Author(s): Donald N. B. Hall; Klaus-Werner Hodapp; David L. Goldsmith; Craig A. Cabelli; Allan K. Haas; Lester J. Kozlowski; Kadri Vural
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Paper Abstract

Hg:Cd:Te grown by Molecular Beam Epitaxy onto a lattice matched Cd:Zn:Te substrate with Double Layer Planar Heterostructure architecture holds promise of extremely low, near theoretical dark current out to wavelengths beyond 5 micrometers while eliminating the persistent images and reduced short-wave quantum efficiency disadvantages of the liquid phase epitaxial (LPE) material now in widespread astronomical use. We report on the characterization of two Rockwell FPAs consisting of (lambda) c approximately 4.75 micrometers MBE material hybridized to 1K by 1K HAWAII multiplexers within the context of establishing their performance relative to the stringent focal plane goals for the Next Generation Space Telescope (NGST). The effort has concentrated primarily on characterizing total FPA noise at selected temperatures from 30 to 90 K although short wave quantum efficiency and image persistence have also been measured. The test procedures are based on the use of both DC and variance nosie techniques and, at T approximately 60K, have allowed characterization of the total noise as the sum of separate contributions due to dark current, read noise and read charge. The test facility and characterization techniques are described and results, which verify the remarkable potential of this material to exceed the NGST performance goals at temperatures both at, and also significantly higher than, the approximate 30K now anticipated for the NGST NIR focal pane, are presented.

Paper Details

Date Published: 16 August 2000
PDF: 12 pages
Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000);
Show Author Affiliations
Donald N. B. Hall, Institute for Astronomy/Univ. of Hawaii at Manoa (United States)
Klaus-Werner Hodapp, Institute for Astronomy/Univ. of Hawaii at Manoa (United States)
David L. Goldsmith, Institute for Astronomy/Univ. of Hawaii at Manoa (United States)
Craig A. Cabelli, Rockwell Science Ctr. (United States)
Allan K. Haas, Rockwell Science Ctr. (United States)
Lester J. Kozlowski, Rockwell Science Ctr. (United States)
Kadri Vural, Rockwell Science Ctr. (United States)

Published in SPIE Proceedings Vol. 4008:
Optical and IR Telescope Instrumentation and Detectors
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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