Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Herriott Donald F2

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Herriott Donald F2

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Jeff Hecht
Image title: 
Donald Herriott
Credit line: 
Bell Laboratories / Alcatel-Lucent USA Inc., courtesy AIP Emilio Segrè Visual Archives, Hecht Collection, Physics Today Collection

Bell Laboratories scientist Donald R. Herriott observes rings produced by alternate interference and transmission of helium-neo laser light through a thin, solid Fabry-Perot filter. This is a technique for measuring filter characteristics. Light spreads conically from the laser; its path length through the filter depends on incident angle. When path length equals and integral number of half-wavelengths, a bright ring is projected. Transmission can be 50-90 percent in brightest part of ring.

Photo date: 
circa 1967
Original format: 
1 photographic print (black and white; 10 x 8 inches)
Herriott, Donald R., 1928-