Hall's work has concentrated on improving the precision and accuracy with which lasers can produce a specific frequency, and the stability with which they can hold that frequency. He has helped to develop a broad range of laser advances in fields such as precision spectroscopy for physical and chemical analysis, new tests of fundamental physical "laws", measurement and redefinition of the speed of light, and other refinements in time and length metrology. These advances are represented by more than 240 publications and 11 US patents, and have been recognized by more than 20 Awards and Prizes from professional societies, and his employer. He became a member of the French Légion d'Honneur in 2004, and has received four Honorary degrees.
Dr. Hall was awarded the 2005 Nobel Prize in Physics, sharing this honor with Theodor W. Hänsch of the Max-Planck-Institute (Garching) and Roy J. Glauber of Harvard University. This recognition was awarded "for their contributions to the development of laser-based precision spectroscopy, particularly the optical frequency comb technique." The optical frequency comb can rapidly measure the frequency of another laser with extraordinarily high precision, and has many broader applications in Science, Metrology and, most recently, in Diagnostic Medicine.
Researchers should cite this work as follows:
John L. Hall (2008), "The Optical Freqency Comb: A Remarkable Tool for Metrology, Science and Medical Diagnostics," https://nanohub.org/resources/6040.
Theater, Norfolk State University, Norfolk, VA