Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Hall John Lewis F1

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Hall John Lewis F1

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Image title: 
Saturated-absorption laser apparatus
Credit line: 
National Bureau of Standards Archives, courtesy AIP Emilio Segrè Visual Archives, Physics Today Collection

Saturated-absorption laser apparatus developed at the National Bureau of Standards for precise measurements of length. John L. Hall (left) and Richard L. Barger view the laser's saturated absorption resonance line in methane vapor on the oscilloscope screen while Dr. Barger adjusts the laser mirror.

Photo date: 
January 1969
Original format: 
1 photographic print (black and white; 10 x 8 inches)
Hall, J. L. (John L.), 1934-
Barger, Richard Lee