A group at MIT has managed to build and operate a laser that functions as such even when the average number of photons in the optical cavity is less than one.
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Maddox, J. The wonders of the microlaser. Nature 373, 101 (1995). https://doi.org/10.1038/373101a0
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DOI: https://doi.org/10.1038/373101a0
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