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A Radiometer for Precision Coherent Radiation Measurements.

Douglas B Thomas1, Edward F Zalewski1

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This study presents a new radiometer for precise coherent radiation measurements. It demonstrates excellent long-term repeatability and stability, making it suitable as a transfer standard.

Keywords:
coherent radiationlaserphotocurrentradiometersilicon photodiode

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Area of Science:

  • Optical Engineering
  • Metrology

Background:

  • Accurate radiometric measurements are crucial for various scientific and industrial applications.
  • Existing radiometers may face challenges with long-term stability and precision, especially for coherent radiation.

Purpose of the Study:

  • To design and test a novel radiometer for high-precision coherent radiation measurements.
  • To evaluate the long-term repeatability, angular uniformity, spatial linearity, and stability of the developed radiometer.

Main Methods:

  • A pn silicon photodiode radiometer was constructed within a nitrogen atmosphere, featuring a quartz window to mitigate interference.
  • Ratio measurements were performed against an absolute type detector over 215 days at 488 nm and 633 nm.
  • Tests for angular uniformity, spatial linearity, and overall performance were conducted.

Main Results:

  • The radiometer exhibited exceptional long-term repeatability, with standard deviations of 0.008% at 488 nm and 0.009% at 633 nm at 0.5 mW.
  • Maximum deviations from the mean were minimal, recorded at 0.016% and 0.015% for the respective wavelengths.
  • The device demonstrated good angular and spatial uniformity and linearity.

Conclusions:

  • The designed radiometer offers high precision and stability for coherent radiation measurements.
  • Its simplicity, portability, and excellent performance characteristics make it a strong candidate for use as a transfer standard in radiometry.