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VOLKER STEGER / SCIENCE PHOTO LIBRARY VOLKER STEGER / SCIENCE PHOTO LIBRARY
John L. Hall (born 1934), American physicist. Hall is Senior Scientist at the National Institute of Standards and Technology, Pittsburgh, USA. In 2005 he shared the Nobel Prize in Physics with Roy Glauber and Theodor Hansch. Hansch and Hall developed laser based precision spectroscopy and the optical frequency comb technique. These methods make it possible to determine the quantum structure of matter with a high degree of accuracy and to test fundamental theories. The methods have allowed lasers with extremely sharp colours to be made and readings made of light of all colours. They have also been used to produce extremely accurate clocks and improved GPS technology.
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