Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Bell Labs F6

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Bell Labs F6

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$20.00
Image title: 
Bell Telephone Laboratories laser beam
Credit line: 
Bell Laboratories / Alcatel-Lucent USA Inc., courtesy AIP Emilio Segrè Visual Archives, Physics Today Collection
Description: 

The two bright areas on the card illustrate the high efficiency of a spectroscopic diffraction grating etched in a new holographic material -- dichromated gelatin. T. A. Shankoff of Bell Telephone Laboratories is directing a laser beam through the grating, which has been formed on the glass slide. Because the beam has a larger diameter than the grating, only the central portion of the beam is diffracted to form the bright spot on the right side of the card. The undiffracted portion of the beam continues straight through the slide to form the doughnut-shaped ring of light to the left. Over 90% of the laser beam has been diffracted from the center of the left-hand beam to form the bright spot on the right. A diffraction grating made from any of the less efficient, conventional holographic materials would have diffracted less than 6% of the beam to produce a much less intense spot.

Original format: 
1 photographic print (black and white; 8 x 10 inches)
Person(s): 
Bell Labs Innovations