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What is the difference between zero and multiple quarter wave plates?

  1. Jun 25, 2015 #1
    Hello
    I have a quarter wave plate for 550 nm but i can't determine which it is a zero quarter wave plate or multiple.

    How can I find m in this formula :
    delta phase =m*2 Pi +Pi/2
    ?

    Thank you.
     
  2. jcsd
  3. Jun 25, 2015 #2
    You can test with other wavelengths, assuming that its indices of refraction (and their difference) does not have too much dispersion.
     
  4. Jun 25, 2015 #3
    But I don't know indices of refractive. Actually absolute phase difference is not specified. I know relative phase difference which is equal to Pi/2 only.
     
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