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

AI Thread Summary
The discussion focuses on distinguishing between zero and multiple quarter wave plates, specifically for a quarter wave plate designed for 550 nm. The key formula for determining the phase difference is delta phase = m*2 Pi + Pi/2, where the variable m is crucial. Testing with different wavelengths can help identify the type of quarter wave plate, provided the indices of refraction remain consistent. However, the user lacks information on the indices of refraction and only knows the relative phase difference is Pi/2. Understanding these factors is essential for accurate identification of the quarter wave plate type.
abbas_majidi
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.
 
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You can test with other wavelengths, assuming that its indices of refraction (and their difference) does not have too much dispersion.
 
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PietKuip said:
You can test with other wavelengths, assuming that its indices of refraction (and their difference) does not have too much dispersion.
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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