Optical clock
Videos
Optical clocks are a subset of atomic clocks and are based on transitions that emit electromagnetic radiation in the range of 200 nm to 1000 nm. Optical light oscillates at frequencies near 500 THz, m
One of NIST's 2013 pair of ytterbium optical lattice atomic clocks
JILA's 2017 three-dimensional (3-D) quantum gas atomic clock consists of a grid of light formed by three pairs of laser beams. A stack of two tables is used to configure optical components around a vacuum chamber. Shown here is the upper table, where lenses and other optics are mounted. A blue laser beam excites a cube-shaped cloud of strontium atoms located behind the round window in the middle of the table. Strontium atoms fluoresce strongly when excited with blue light.
John L. Hall
Videos
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.