Tiny lasers can be made from soap bubbles

Soap bubbles can be turned into lasers that are exceptionally good at sensing electric fields and pressure.

“To get lasing, almost any bubble is fine. We’ve used regular hand soaps or a mixture that you can buy for children. You just need to put a small amount of fluorescent dye inside, and it works perfectly,” says Matjaž Humar at the University of Ljubljana in Slovenia, who produced the bubble lasers with Zala Potočnik, also at the University of Ljubljana.

Lasers require three key components. The first is a cavity in which light can bounce back and forth.…

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