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[–] prairie 0 points 2 points (+2|-0) ago  (edited ago)

So they actually aren't "storing" light as acoustic waves, just translating the information encoded in the light to information encoded in sound. Old tech. Even more recently videocassette players used a piece of glass as a delay line, sending acoustic waves bouncing around it then transducing them back to electricity.

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[–] janesmonday [S] ago 

The speed is the crucial element here!