High-accuracy optical power measurements by using electrical-substitution cryogenic radiometer

Özcan Bazkir; Sevilay Ugur; Farhad Samedov; Akif Esendemir

doi:10.1117/1.1829097

1 January 2005 High-accuracy optical power measurements by using electrical-substitution cryogenic radiometer

Özcan Bazkir; Sevilay Ugur; Farhad Samedov; Akif Esendemir

Author Affiliations +

Optical Engineering, 44(1), 016401 (2005). https://doi.org/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.

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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). https://doi.org/10.1117/1.1829097 . Submission:

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