1 January 2005 High-accuracy optical power measurements by using electrical-substitution cryogenic radiometer
Author Affiliations +
Optical Engineering, 44(1), 016401 (2005). doi:10.1117/1.1829097
Abstract
An optical power scale is established at Ulusal Metroloji Enstitüsü (UME) using the helium-cooled primary-level electrical-substitution cryogenic radiometer. The scale is established at discrete laser wavelengths of vertically polarized tuneable Ar+, fixed He-Ne, and Nd:YAG (with second harmonic) laser sources. To increase measurement accuracy, laser intensities are stabilized to better than 0.009% using an electro-optical modulator. The spatial profiles of polarized laser beams are cleaned with a spatial filter. The optical power is measured using the static substitution method with an uncertainty of a few parts in 10–4. Repeatability of optical power measurements in the static substitution method, the measurement of window transmittance, and the measurement of power in a scattered beam are the most significant uncertainty components.
Özcan Bazkir, Sevilay Ugur, Farhad Samedov, Akif Esendemir, "High-accuracy optical power measurements by using electrical-substitution cryogenic radiometer," Optical Engineering 44(1), 016401 (1 January 2005). http://dx.doi.org/10.1117/1.1829097
JOURNAL ARTICLE
6 PAGES


SHARE
KEYWORDS
Optical testing

Radio optics

Temperature metrology

Radiometry

Transmittance

Cryogenics

Photodiodes

Back to Top