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Stability of the spectral responsivity of cryogenically cooled InSb infrared detectors.
MedLine Citation:
PMID:  16237922     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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 degrees 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.
Authors:
Evangelos Theocharous
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  44     ISSN:  0003-6935     ISO Abbreviation:  Appl Opt     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-10-21     Completed Date:  2006-02-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6087-92     Citation Subset:  -    
Affiliation:
Optical Radiation Team, Quality of Life Division, National Physical Laboratory, Middlesex TW 11 OLW, United Kingdom. e.theo@npl.co.uk
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