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I'm blown away by this. If I'm understanding this correctly, this picture[1] is light traveling for a distance of about 3/8ths of an inch.

[1] https://media.nature.com/w800/magazine-assets/d41586-019-016...

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Wait, the light is all incoherent before it passes the dotted line, then coherent until it bounces and passes back through? What's going on?

You have to remember that's scattered light.

I believe the area between the dotted and solid lines is a mirror. The blob of light is visible because it's passing through some medium that scatters it, then when it disappears it has been absorbed by the mirror, then we see it reemitted shortly after.

The solid line is the mirror, the dotted line is the edge of the scattering medium. I assume there is air or vacuum in between.

Did you see measurements somewhere or are you just estimating from the time counter and the speed of light?

Estimating based on the time counter.

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