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Applied Optics

Applied Optics


  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 29 — Oct. 10, 2005
  • pp: 6087–6091

Stability of the spectral responsivity of cryogenically cooled InSb infrared detectors

Evangelos Theocharous  »View Author Affiliations

Applied Optics, Vol. 44, Issue 29, pp. 6087-6091 (2005)

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The spectral responsivity of two cryogenically cooled InSb detectors was observed to drift slowly with time. The origin of these drifts was investigated and was shown to occur due to a water-ice thin film that was deposited onto the active areas of the cold detectors. The presence of the ice film (which is itself a dielectric film) modifies the transmission characteristics of the antireflection coatings deposited on the active areas of the detectors, thus giving rise to the observed drifts. The magnitude of the drifts was drastically reduced by evacuating the detector dewars while baking them at 50 °C for approximately 48 h. All InSb detectors have antireflection coatings to reduce the Fresnel reflections and therefore enhance their spectral responsivity. This work demonstrates that InSb infrared detectors should be evacuated and baked at least annually and in some cases (depending on the quality of the dewar and the measurement uncertainty required) more frequently. These observations are particularly relevant to InSb detectors mounted in dewars that use rubber O rings since the ingress of moisture was found to be particularly serious in this type of dewar.

© 2005 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation

ToC Category:

Original Manuscript: February 17, 2005
Revised Manuscript: May 6, 2005
Manuscript Accepted: May 6, 2005
Published: October 10, 2005

Evangelos Theocharous, "Stability of the spectral responsivity of cryogenically cooled InSb infrared detectors," Appl. Opt. 44, 6087-6091 (2005)

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  1. E. Theocharous, N. P. Fox, “Reversible and apparent aging effects in infrared detectors,” Metrologia 40, S136–S140 (2003). [CrossRef]
  2. W. M. Irvine, J. B. Pollack, “Infrared optical properties of water and ice spheres,” Icarus 8, 324–360 (1968). [CrossRef]
  3. E. Theocharous, G. Hawkins, N. P. Fox, “Reversible aging effects in cryogenically-cooled infrared filter radiometers,” Infrared Phys. Technol. 46, 339–349 (2004). [CrossRef]
  4. E. Theocharous, N. P. Fox, “Aging effects in cryogenically cooled InSb infrared filtered detectors,” Meas. Sci. Technol. 16, 578–582, 2005. [CrossRef]
  5. E. Theocharous, “Drifts exhibited by cryogenically cooled InSb infrared filtered detectors and their importance to the ATSR-2 and Landsat-5 Earth observation missions,” Appl. Opt. 44, 4181–4185 (2005). [CrossRef] [PubMed]
  6. I. Kudman, Infrared Associates, 2851 SE Monroe Street, Stuart, Florida 34997 (private communication).
  7. L. W. Wolfe, G. J. Zissis, The Infrared Handbook, 3rd ed. (Office of Naval Research, Washington, D.C., 1989), Chap. 11.
  8. E. Theocharous, J. R. Birch, “Detectors for Mid- and Far-infrared Spectroscopy: Selection and Use,” in Handbook of Vibrational Spectroscopy, J. M. Chalmers, P. R. Griffiths, eds. (Wiley, 2002), Vol. 1, pp. 349–367.
  9. E. Theocharous, F. J. J. Clarke, L. J. Rodgers, N. P. Fox, “Latest techniques at NPL for the characterization of infrared detectors and materials,” Proc. SPIE 5209, 228–239 (2003). [CrossRef]
  10. J. Lehman, E. Theocharous, G. Eppeldauer, C. Pannel, “Gold-black coatings for freestanding pyroelectric detectors,” Meas. Sci. Technol. 14, 916–922 (2003). [CrossRef]
  11. A. Velasquez, Judson Technologies Inc., Montgomeryville, Pennsylvania 18936 (private communication).

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