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HUP and the Double-Slit Experiment

  1. Oct 4, 2009 #1


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    Consider the following double-slit experiment: The source is an optical laser. The beam is, say, ½-inch wide and the laser is located far enough, say 10 yards, from the 2 slits to guarantee a large uncertainty in position (because of the very small uncertainty in the momentum direction). Obviously, the half-inch wide beam must cover the 2 slits.

    I believe the above experiment would produce the classic interference pattern.

    Now imagine moving the laser source closer and closer to the 2 slits so that the uncertainty in the momentum direction slowly increases. Would there be some point (distance between laser source and the 2 slits) at which the interference pattern would disappear because the experimental setup would no longer guarantee a large uncertainty in position?

    As always, thanks in advance.
  2. jcsd
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