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Laser physics

A phase it's going through

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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Figure 1: Light from a quantum cascade.

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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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