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A continuously variable optical attenuator is described that uses optical fiber light guides and high-accuracy dial micrometers mounted on mechanical stages. The attenuation factors thereby obtained have proved reproducible to ∼0.1% over a dynamic range of 1:20. It should, therefore, be particularly useful in testing the linearity of the response of various photodetectors.
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Yamashita et al. (1985) studied this question.
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