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Physicists built an 'anti-laser' to charge your phone from across a room
Live Science ^ | 20 November 2020 | Rafi Letzter

Posted on 11/20/2020 7:04:46 PM PST by BenLurkin

Just like a laser emits light particles, or photons, one after another in a neat and orderly row, an anti-laser sucks up photons one after another in reverse order. Researchers have long speculated that a device like this might make wires and charging cables a thing of the past, allowing people to beam energy invisibly across a room to a laptop or phone and power it without plugging it in. But though basic anti-lasers have been tested before, the real world isn't as neat and orderly as a laser pointed at a fixed receiver in a laboratory. Electronics move around, objects get in the way, walls reflect energy in unexpected ways. The new anti-laser demonstrated in this experiment accounts for all that, and it receives scattered energy beamed around a space in an unpredictable pattern — still receiving 99.996% of the sent power.

...

Until now, even the most complex CPA experiments have had time reversal symmetry. Some were more complex than the laser pointer aimed at a receiver. But even complicated projects have that symmetry if they're set up such that the process can be reversed.

But for this new work, the researchers used magnetic fields to jostle the photons so aggressively that time reversal symmetry was lost. The process of transferring power — shooting the photons — was like stirring soup: It doesn't work backward. (Imagine trying to un-stir soup.) But the device still received the power.

(Excerpt) Read more at livescience.com ...


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To: Dr. Sivana

LOL!


21 posted on 11/21/2020 3:56:05 AM PST by DannyTN (<P><a href="https://www.freerepublic.com/focus/f-chat/3902132/posts">)
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To: Dr. Sivana
why Superman must never marry Lois Lane.

"Man of Steel, Woman of Kleenex"

What could possibly go wrong? Imagine relativistic sperm looking for an egg.

22 posted on 11/21/2020 10:47:28 AM PST by no-s
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To: bigbob
Sounds like a great application for the DED - the Dark Emitting Diode.
If this thing absorbs and converts to electricity 100% of the energy in a laser beam . . .

Seriously, a stack of old-fashioned double edge razor blades can function as a “dark emitter.” In the sense that light striking the stack gets channelled further and further in, and by wave cancelation the light “goes there to die."


23 posted on 11/21/2020 11:05:10 AM PST by conservatism_IS_compassion (Socialism is cynicism directed towards society and - correspondingly - naivete towards government.)
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To: BenLurkin

The uncle laser can take your phone and lock it up until you get your homework done.


24 posted on 11/22/2020 6:23:18 PM PST by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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