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Improved fabrication techniques for infrared bolometersIon implantation and sputter metallization are used to produce ohmic electrical contacts to Ge:Ga chips. The method is shown to give a high yield of small monolithic bolometers with very little low-frequency noise. It is noted that when one of the chips is used as the thermometric element of a composite bolometer it must be bonded to a dielectric substrate. The thermal resistance of the conventional epoxy bond is measured and found to be undesirably large. A procedure for soldering the chip to a metallized portion of the substrate in such a way as to reduce this resistance is outlined. An evaluation is made of the contribution of the metal film absorber to the heat capacity of a composite bolometer. It is found that the heat capacity of a NiCr absorber at 1.3 K can dominate the bolometer performance. A Bi absorber possesses significantly lower heat capacity. A low-temperature blackbody calibrator is built to measure the optical responsivity of bolometers. A composite bolometer system with a throughput of approximately 0.1 sr sq cm is constructed using the new techniques. The noise in this bolometer is white above 2.5 Hz and is slightly below the value predicted by thermodynamic equilibrium theory.
Document ID
19830065524
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lange, A. E.
(California Univ. Berkeley. Lawrence Berkeley Lab, CA, United States)
Mcbride, S. E.
(California Univ. Berkeley. Lawrence Berkeley Lab, CA, United States)
Richards, P. L.
(California Univ. Berkeley. Lawrence Berkeley Lab, CA, United States)
Haller, E. E.
(California, University Lawrence Berkeley Laboratory, Berkeley, CA, United States)
Kreysa, E.
(California, University Lawrence Berkeley Laboratory, Berkeley, CA; Max-Planck-Institut fuer Radioastronomie, Bonn, Germany)
Date Acquired
August 11, 2013
Publication Date
September 1, 1983
Publication Information
Publication: International Journal of Infrared and Millimeter Waves
Volume: 4
ISSN: 0195-9271
Subject Category
Instrumentation And Photography
Accession Number
83A46742
Funding Number(s)
CONTRACT_GRANT: DE-AC03-76SF-00098
CONTRACT_GRANT: NASA ORDER W-14606
Distribution Limits
Public
Copyright
Other

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