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Generalized Electrical Substitution Methods and Detectors for Absolute Optical Power Measurements.

S I Woods1, J E Neira2, J E Proctor2

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Researchers developed new electrical substitution methods and fast cryogenic detectors for precise optical power calibration. These advancements enable absolute calibration of spectral and dynamic optical power, improving measurement accuracy and reducing calibration chains.

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Area of Science:

  • Metrology
  • Optical Physics
  • Materials Science

Background:

  • Electrical substitution radiometers (ESRs) are primary standards for optical power calibration.
  • Traditional cryogenic ESRs have slow response times and are difficult to operate, limiting their direct use.
  • Accurate calibration of spectral and dynamic optical power is crucial for various scientific applications.

Purpose of the Study:

  • To develop generalized methods for electrical substitution optical measurements.
  • To create fast-response cryogenic detectors for implementing these methods.
  • To enhance the accuracy and efficiency of optical power calibrations.

Main Methods:

  • Developed generalized electrical substitution methods for measuring arbitrary periodic waveforms.
  • Engineered fast-response cryogenic bolometers with carbon nanotube absorbers using microfabrication.
  • Integrated new detectors with generalized electrical substitution for optical calibrations.

Main Results:

  • Achieved detector response uncertainty of 0.13% (k=1) and total measurement uncertainty of 1.1% (k=1) in mid-infrared spectral detector responsivity calibrations.
  • Demonstrated response times near 10 ms for the new cryogenic detectors.
  • Verified the capability of the generalized method for absolute calibration of spectral and dynamic optical power.

Conclusions:

  • The generalized electrical substitution method combined with fast cryogenic detectors significantly expands the scope of primary standard optical power calibrations.
  • These advancements can shorten calibration chains and improve measurement uncertainties.
  • The developed detectors are manufacturable and suitable for a wide spectral range (UV to far-infrared).