Ytterbium Optical Clock
by Andrew Brookes, National Physical Laboratory/science Photo Library
Title
Ytterbium Optical Clock
Artist
Andrew Brookes, National Physical Laboratory/science Photo Library
Medium
Photograph - Photograph
Description
Ytterbium optical clock. Inside this optical clock, also known as a frequency standard, is an ion trap (centre), where ytterbium ions oscillate between two energy levels in response to the light of a laser beam. Counting these oscillations is the basis for the standard second. The current basis for the international definition of time is the caesium atomic clock, where one second is about 9193 million oscillations of caesium-133 atoms. Optical clocks are believed to be more precise than the caesium clock as higher numbers of oscillations in a given time provide a more accurate measurement. Photographed at the National Physical Laboratory in Teddington, UK.
Uploaded
October 2nd, 2018
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