Abstract
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
Full Article | PDF ArticleMore Like This
D. L. Franzen and L. B. Schmidt
Appl. Opt. 15(12) 3115-3122 (1976)
Björn Globisch, Roman J. B. Dietz, Thorsten Göbel, Martin Schell, Werner Bohmeyer, Ralf Müller, and Andreas Steiger
Opt. Lett. 40(15) 3544-3547 (2015)
Lucy L. Hale, C. Thomas Harris, Ting Shan Luk, Sadhvikas J. Addamane, John L. Reno, Igal Brener, and Oleg Mitrofanov
Opt. Lett. 46(13) 3159-3162 (2021)