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Optical Engineering

High-accuracy optical power measurements by using electrical-substitution cryogenic radiometer
Author(s): Özcan Bazkir; Sevilay Ugur; Farhad Samedov; Akif Esendemir
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Paper 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.

Paper Details

Date Published: 1 January 2005
PDF: 6 pages
Opt. Eng. 44(1) 016401 doi: 10.1117/1.1829097
Published in: Optical Engineering Volume 44, Issue 1
Show Author Affiliations
Özcan Bazkir, Ulusal Metroloji Enstitütsü (Turkey)
Sevilay Ugur, Ulusal Metroloji Enstitusu (Turkey)
Farhad Samedov, TUBITAK National Metrology Institute (Turkey)
Akif Esendemir, Middle East Technical Univ. (Turkey)


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