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The National Institute of Standards and Technology (NIST) improved optical radiant flux calibrations using calorimeters. Reassessing uncertainty contributions, particularly from light scattering, refined calibration accuracy for laser power and energy meters.

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Area of Science:

  • Metrology
  • Optical physics
  • Radiometry

Background:

  • The National Institute of Standards and Technology (NIST) calibrates laser power and energy meters using detector-based optical radiant flux scales.
  • Calibrations between 1 µW and 2 W currently rely on calorimeter-based realizations.

Purpose of the Study:

  • To reassess and improve the accuracy of optical radiant flux calibrations.
  • To identify and mitigate dominant uncertainty contributions in calorimeter-based calibrations.

Main Methods:

  • Utilized calorimeters for calibrations in the 1 µW to 2 W range.
  • Performed thermal modeling to reassess electro-optical inequivalence.
  • Investigated light scattering from a legacy window as a dominant uncertainty source.

Main Results:

  • Reassessed inherent electro-optical inequivalence to be 0.03%.
  • Corrected principal inequivalence contributions, shifting scale representation by under 0.2%.
  • Updated uncertainty contributions, resulting in a combined expanded uncertainty of 0.84% (k=2).

Conclusions:

  • The reassessment of uncertainty contributions, particularly light scattering, refined the accuracy of optical radiant flux calibrations.
  • The revised uncertainty is 0.84%, comparable to previous levels, ensuring reliable calibration for laser power and energy meters.