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Half wave equation is this right?

  1. Nov 19, 2008 #1
    Hey, I've been asked to find the minimum thickness for a slab of crystalline sapphire. The equation for the half wave plate is :

    d(ne-no) = (m+1/2)*lambda

    I found the minimum by using the fact that m=0

    It then asks what the other wavelengths are which will allow the plate to act as a Half wave plate.
    Do I just plug integers in starting from 1 or is that wrong?
    Thanks :)
     
  2. jcsd
  3. Nov 20, 2008 #2
    Yes, for shorter wavelengths, you can get retardations of 3/2 waves, 5/2 waves etc. - which are equivalent to half wave shifts.
     
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