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Laser from sound
Fact 4: Turn it into a Laser
Lasers are pretty cool, right? A laser works by emitting light at a very narrow wavelength. This is an efficient way to move energy around, and because light travels in a vacuum, it can be used anywhere. Because of this, lasers had only been ever made out of light waves. Sound waves, on the other hand, require a medium to travel through, which is why the idea of using sound in lasers seemed far off. But in 2010, scientists in Japan created a device that emits these “phasers” at 170 kHz, which is 8 times the highest frequency humans can perceive. Sure this isn’t as exciting as a laser light show at the museum, but it still has useful applications in the fields of medicine and computers