A special type of optical amplifier based on a vapour of rubidium has been demonstrated that makes faint images brighter without adding noise. This concept could find use in biological imaging and image processing.
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Clemmen, S., Gaeta, A. Brighter images with no added noise. Nature 491, 202–203 (2012). https://doi.org/10.1038/491202a
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DOI: https://doi.org/10.1038/491202a
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