What Is Zernike Mixing in Optical Materials?

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Zernike mixing refers to the undesirable combination of different types of aberrations in optical materials, which can affect performance. The term is not widely recognized in optics literature, leading to confusion about its specific meaning. Zernike polynomials, used to describe lens aberrations, are orthogonal and typically do not mix. The discussion highlights the need for clarity in terminology when comparing optical materials like silicon and zirconium. Understanding the implications of Zernike mixing is crucial for evaluating optical performance.
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Zernike mixing - ?

Hi. I understand that Zernike was a physicist and that he did some work in optics, and am also aware of the Zernike Polynomials which are used in optics to describe aberrations in lenses, etc. What I do not understand is a comment that I got (from a non-native English speaker) in comparing optical materials (Si and Zr) regarding one having "Zernike Mixing" (apparently not desirable) and another not having it. What is "mixing" in "Zernike Mixing"? Does it refer to the mixing of different kinds of aberrations (polynomials) or something akin?
 
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Zernike polynomials are used to describe aberrations in wave optics and are (sort of) interchangable with Seidel coefficients. Zernike polynomials are orthogonal on the unit circle, so I can't understand what is being 'mixed'. I have never head of the term 'Zernike mixing'.
 
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