When we observe laser light, we typically measure its intensity, and so wave amplitude. The phase, which encodes further details of the laser's internal workings, was obscure — but fresh light is being shed on it.
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Citrin, D. A phase it's going through. Nature 449, 669–670 (2007). https://doi.org/10.1038/449669a
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DOI: https://doi.org/10.1038/449669a