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An acoustooptic method of measuring the noise equivalent power of optical heterodyne systems

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Abstract

The noise equivalent power of optical heterodyne detection at 10.6 μm has been measured with a method based on Raman-Nath diffraction of a CO2 laser beam. One of the frequency shifted first order diffracted beams is used as the signal radiation. The local oscillator radiation is obtained by splitting off a part of the laser beam incident upon the device used for the acoustooptic diffraction. The signal power can be varied over a large dynamic range by changing the acoustic input power. A study of the probable errors shows that the total error in the NEP measurement is less than 30%.

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Authors and Affiliations

  1. Department of Electrical Measurements, Chalmers University of Technology, Göteborg, Sweden

    H. Eklund & S. T. Eng

  2. The Research Institute of the Swedish National Defence, Stockholm, Sweden

    E. Daniels

Authors
  1. H. Eklund
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  2. S. T. Eng
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  3. E. Daniels
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Eklund, H., Eng, S.T. & Daniels, E. An acoustooptic method of measuring the noise equivalent power of optical heterodyne systems. Opt Quant Electron 7, 361–369 (1975). https://doi.org/10.1007/BF00619834

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  • DOI: https://doi.org/10.1007/BF00619834

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