Tiny lasers can be made from soap bubbles

Soap bubbles can be became lasers which can be exceptionally good at sensing electrical fields and strain.

“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 on the University of Ljubljana in Slovenia, who produced the bubble lasers with Zala Potočnik, additionally on the University of Ljubljana.

Lasers require three key elements. The first is a cavity by which gentle can bounce backwards and forwards.…