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Laser intensity vs materials

  1. Nov 28, 2012 #1
    There are materials which block laser beams (or light globally) or weaken its intensity via shading i.e. a beam must have crossed a specific energy barrier in order to pass this shading where beams with less energy will fade and won't pass. The question is, is there a material or a type of shading which does the opposite? Meaning that it blocks beams with intensities higher than a specific barrier and allows those with less intensities (behaving like a low pass filter somehow), does this type of material exist?!
  2. jcsd
  3. Nov 28, 2012 #2


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    Staff: Mentor

    Are you thinking about nonlinear effects like saturation here?

    I see an obvious issue for the opposite effect: If you weaken your high-intensity beam with some nonlinear effect, it becomes a low-intensity beam after a while (as no interaction will be point-like) and could pass.
    Multi-photon processes depend on the beam intensity, but a beam with a higher intensity will keep a higher intensity, even if it is weakened more than a low-intensity beam.
  4. Nov 28, 2012 #3
    Is this a question about scifi shields? You can see though it, but it blocks laser?
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