New paper on #ArXiv!
When (coherent) light propagates in a multimode fibre, each mode accumulates a slightly different phase, so the output looks like a random speckle patter.
But it is NOT random!
This non-randomness has a number of consequences, among them the fact that the you get predictable patterns in the apparently random output. We show that a focused input will always result in a ring of excess intensity at the same radius of the input (and suggest how this might be useful).

#Optics#OpticalFibre

Animation of the output of a 50um diameter and 20m long multimode fibre (speckle pattern in grayscale) as a function of the position of the input focus (red dot)
Animation of the output of a 50um diameter and 20m long multimode fibre (speckle pattern in grayscale) as a function of the position of the input focus (red dot)

New paper on #ArXiv!
When (coherent) light propagates in a multimode fibre, each mode accumulates a slightly different phase, so the output looks like a random speckle patter.
But it is NOT random!
This non-randomness has a number of consequences, among them the fact that the you get predictable patterns in the apparently random output. We show that a focused input will always result in a ring of excess intensity at the same radius of the input (and suggest how this might be useful).

#Optics#OpticalFibre

Animation of the output of a 50um diameter and 20m long multimode fibre (speckle pattern in grayscale) as a function of the position of the input focus (red dot)
Animation of the output of a 50um diameter and 20m long multimode fibre (speckle pattern in grayscale) as a function of the position of the input focus (red dot)

This is sickening

#Trump's Military Audience While in Uniform Were Checked for Allegiance

“Internal 82nd Airborne Division communications reviewed by Military.com reveal a tightly orchestrated effort to #curate the #optics of Trump's recent visit, including HANDPICKING SOLDIERS for the audience based on #political leanings & physical appearance.

One unit-level message bluntly saying: "No fat soldiers."

#propaganda #disrespect#DearLeader #authoritarianism
https://www.military.com/daily-news/2025/06/11/bragg-soldiers-who-cheered-trumps-political-attacks-while-uniform-were-checked-allegiance-appearance.html

This is sickening

#Trump's Military Audience While in Uniform Were Checked for Allegiance

“Internal 82nd Airborne Division communications reviewed by Military.com reveal a tightly orchestrated effort to #curate the #optics of Trump's recent visit, including HANDPICKING SOLDIERS for the audience based on #political leanings & physical appearance.

One unit-level message bluntly saying: "No fat soldiers."

#propaganda #disrespect#DearLeader #authoritarianism
https://www.military.com/daily-news/2025/06/11/bragg-soldiers-who-cheered-trumps-political-attacks-while-uniform-were-checked-allegiance-appearance.html

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From: @MPI_ScienceOfLight
https://wisskomm.social/@MPI_ScienceOfLight/113906463840724222