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Applied Optics

Applied Optics


  • Vol. 38, Iss. 34 — Dec. 1, 1999
  • pp: 7047–7055

Domain-engineered pyroelectric radiometer

John Lehman, George Eppeldauer, J. Andrew Aust, and Miklos Racz  »View Author Affiliations

Applied Optics, Vol. 38, Issue 34, pp. 7047-7055 (1999)

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We built a large-area domain-engineered pyroelectric radiometer with high spatial and spectral response uniformity that is an excellent primary transfer standard for measurements in the near- and the mid-infrared wavelength regions. The domain engineering consisted of inverting the spontaneous polarization over a 10-mm-diameter area in the center of a uniformly poled, 15.5 mm × 15.5 mm square, 0.25-mm-thick LiNbO3 plate. Gold black was used as the optical absorber on the detector surface, and an aperture was added to define the optically sensitive detector area. Our results indicate that we significantly reduced the acoustic sensitivity without loss of optical sensitivity. The detector noise equivalent power was not exceptionally low but was nearly constant for different acoustic backgrounds. In addition, the detector’s spatial-response uniformity variation was less than 0.1% across the 7.5-mm-diameter aperture, and reflectance measurements indicated that the gold-black coating was spectrally uniform within 2%, from 800 to 1800 nm. Other detailed evaluations of the detector include detector responsivity as a function of temperature, electrical frequency response, angular response, and field of view.

© 1999 Optical Society of America

OCIS Codes
(040.0040) Detectors : Detectors
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(230.0230) Optical devices : Optical devices

Original Manuscript: June 23, 1999
Revised Manuscript: September 3, 1999
Published: December 1, 1999

John Lehman, George Eppeldauer, J. Andrew Aust, and Miklos Racz, "Domain-engineered pyroelectric radiometer," Appl. Opt. 38, 7047-7055 (1999)

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