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Minimum Gaussian Beam waist!

  1. Mar 15, 2009 #1
    Physics students out there...how do you find the Minimum Beam waist after being given the beam waist and the focal length of a lens? Please help!!!
  2. jcsd
  3. Mar 15, 2009 #2

    Andy Resnick

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    The quantity (beam waist)*(beam divergence) is conserved in linear optic systems. How does the lens change the beam divergence?
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