Researchers are making quick progress toward high-frequency sound lasers that could be used for precise and non-destructive medical imaging. (Credit: Alan Stonebraker)
Fifty years after the invention of the optical laser, two separate research groups have independently made important steps toward making phonon lasers — a type of laser that emits very high-frequency, coordinated sound rather than light waves — a reality. The studies, published in the journal Physical Review Letters, could lead to a completely new kind of laser that could find interesting applications in medical imaging.
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