A frequency comb or spectral comb is a spectrum made of discrete and regularly spaced spectral lines.
In optics, a frequency comb can be generated by certain laser sources.
Spectrum of the light from the two-laser frequency combs installed on the High Accuracy Radial Velocity Planet Searcher.
John Lewis "Jan" Hall is an American physicist, and Nobel laureate in physics. He shared the 2005 Nobel Prize in Physics with Theodor W. Hänsch and Roy Glauber for his work in precision spectroscopy.
Hall at the 2012 Lindau Nobel Laureate Meeting
President George W. Bush meets with the 2005 Nobel Prize recipients. From left to right are Dr. John Hall, 2005 Nobel Prize in Physics; Dr. Thomas C. Schelling, 2005 Nobel Prize in Economic Sciences; Dr. Roy J. Glauber, 2005 Nobel Prize in Physics; Dr. Richard R. Schrock and Dr. Robert H. Grubbs, 2005 Nobel Prize winners in Chemistry.