What do optical frequency combs do?Optical frequency combs are specialized lasers that act like a ruler for light. They measure exact frequencies of light — from the invisible infrared and ultraviolet to visible red, yellow, green and blue light — quickly and accurately.These Nobel Prize-winning devices fill an important technological gap. Optical frequency combs allow scientists to measure and control light waves as if they were radio waves. With optical frequency combs, technologies that emplo...