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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 6 — Mar. 15, 2014
  • pp: 1609–1612

Calorimetric measurement of absolute terahertz power at the sub-microwatt level

Hitoshi Iida, Moto Kinoshita, Kuniaki Amemiya, and Yozo Shimada  »View Author Affiliations

Optics Letters, Vol. 39, Issue 6, pp. 1609-1612 (2014)

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We developed a calorimeter for determining absolute terahertz (THz) power. The calorimeter is based on a DC substitution method using an isothermal temperature-control technique. A neutral-density optical filter glass was used as a volume absorber, and its THz absorption was evaluated by a time-domain spectrometer. Highly sensitive measurement of the absolute THz power was experimentally achieved in the range from the submicrowatt to microwatt level at room temperature. Power measurement of a continuous-wave THz source using a photomixer was demonstrated. This calorimeter is expected to demonstrate the traceability of THz power at a submicrowatt level.

© 2014 Optical Society of America

OCIS Codes
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing
(040.2235) Detectors : Far infrared or terahertz

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: January 22, 2014
Revised Manuscript: February 11, 2014
Manuscript Accepted: February 12, 2014
Published: March 12, 2014

Hitoshi Iida, Moto Kinoshita, Kuniaki Amemiya, and Yozo Shimada, "Calorimetric measurement of absolute terahertz power at the sub-microwatt level," Opt. Lett. 39, 1609-1612 (2014)

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