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Parallel light rays through a sprial wave plate diverge?

  1. Jun 19, 2015 #1
    Do parallel light rays diverge if ever so slightly upon exiting a spiral wave plate? See image below.



    Images from,


    If there is divergence does that change the angular mementum of the light?

    Thanks for any help!
  2. jcsd
  3. Jun 19, 2015 #2
    If there is no interface between those glas parts where would you expect any special things but a straight beam?
    It makes no sense from the very beginning.
  4. Jun 20, 2015 #3
    The first image above seems to show a typical light ray bending.
  5. Jun 20, 2015 #4
    Come on... the symmetry is circular and waves here are as I expect them...it seems to be homogenieous material .... you can find silly ways to bend light but in the end you will have nothing but light, may be polarized. From symmetry reasons the outcouming is nonsense. If it is homgeneous stuff.
    May be harsh critics but I think Spinnor will report about it.
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