Lasers Invention to Application (1987) / Chapter Skim
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Lasers in Science
Lasers in Science
Pages 118-122
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From page 118... ...
in the United States. The organic dye molecules have broad emission bands, and tuning is done by introducing a rotatable diffraction grating, which acts as a tunable mirror, into the laser resonator.
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From page 119... ...
at Stanford University used this method to observe theoretically predicted fine structure in the Balmer spectrum of hydrogen, including the first optical observation of the Lamb shift. Two-photon interactions, using oppositely directed beams, were proposed by Chebotayev and associates in 1970 (Vasilenko et al., 1970)
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From page 120... ...
By holding the laser beam on the material for a long time, one can do precision spectroscopy. Hurst, Payne, and associates at Oak Ridge National Laboratory have also developed methods for detecting single atoms and have shown a number of important applications to nuclear physics (Hurst et al., 19791.
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From page 121... ...
In these latter experiments, calcium atoms were excited by photon transitions and then emitted blue photons and green photons. Detectors were placed far apart, and polarization was checked for the two.
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From page 122... ...
Of course, this is not transmission of a signal faster than light but only a correlation of probability, and many physicists say' "Naturally, it's just what quantum mechanics predicts." Others find it disturbing. A more detailed discussion of the issue is given by Mermin (19851.
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