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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 12 — Jun. 15, 2012
  • pp: 2346–2348

Towards a fiber-coupled picowatt cryogenic radiometer

N. A. Tomlin, J. H. Lehman, and S. Nam  »View Author Affiliations

Optics Letters, Vol. 37, Issue 12, pp. 2346-2348 (2012)

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A picowatt cryogenic radiometer (PCR) has been fabricated at the microscale level for electrical substitution optical fiber power measurements. The absorber, electrical heater, and thermometer are all on a micromachined membrane less than 1 mm on a side. Initial measurements with input powers from 50 fW to 20 nW show a response inequivalence between electrical and optical power of 8%. A comparison of the response to electrical and optical input powers between 15 pW to 70 pW yields a repeatability better than ±0.3% (k=2). From our first optical tests, the system has a noise equivalent power of 5×1015W/Hz at 2 Hz, but simple changes to the measurement scheme should yield an NEP 2 orders of magnitude lower.

OCIS Codes
(040.3780) Detectors : Low light level
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing
(120.5630) Instrumentation, measurement, and metrology : Radiometry

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 15, 2012
Revised Manuscript: March 27, 2012
Manuscript Accepted: April 2, 2012
Published: June 11, 2012

N. A. Tomlin, J. H. Lehman, and S. Nam, "Towards a fiber-coupled picowatt cryogenic radiometer," Opt. Lett. 37, 2346-2348 (2012)

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