I Viewing light at four trillion frames per second

  • Thread starter zincshow
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Summary
These researchers appear to be imaging a pulse of light travelling at the speed of light. Unfortunately, the detail is behind a paywall. Why does the light appear to pulse bright to dark over about a 5ps timeframe?
https://www.nature.com/articles/d41586-019-01625-5?utm_source=Nature+Briefing&utm_campaign=567cff556e-briefing-wk-20190524&utm_medium=email&utm_term=0_c9dfd39373-567cff556e-42247907
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The are not viewing a light beam, they are viewing the scattered light as the beam travels through a material. I'd guess that the scattering is variable based on the characteristics of the material.
 

Wrichik Basu

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2018 Award
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The article under discussion has been published in Phys. Rev. Lett. From the news article by APS, the caption of the video says:
In this 33-picosecond clip produced with the new technique, a light pulse (red blob) travels through a transparent solid. Upon reaching the edge of the material (dashed line), the pulse travels invisibly through air, hits a mirror, and then re-enters the material.
(Emphasis added)

The reference to the paper (for future visitors, in case the link is unavailable) is:
Yu Lu et al., Compressed Ultrafast Spectral-Temporal Photography, Phys. Rev. Lett. 122, 193904 – Published 17 May 2019
 
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In what seems to be a similar technique, this YouTube clip makes it easier to appreciate the making of such "light speed" imagery as reflections from within a plastic water bottle (diluted with a trace of milk) track the movement of a laser pulse.

 

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