Hello friends, good time...
An article mentioned that:
"The asymmetrical phase masks extend the depth of field greater than the radially symmetrical phase masks."
Another article mentioned:
"The circular symmetric type is the standard of even order polynomial, the depth of field extension effect is about two times of original."
Do you know the range of the depth of focus extension by symmetrical and (or) asymmetrical phase masks?
Do all symmetric phase masks, extend the depth of focus by (or almost) 2 times?
Thank you for your attention in advance.
Phase masks divided into 2 groups:
1. Circular symmetric phase mask 2. Asymmetric phase mask.
Another name of radial symmetric phase mask is Circular symmetric phase mask. So extension of depth of field of symmetric group of phase masks is 2 times of original.
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