I looked at the following article.
How diffractive surfaces are modeled in OpticStudio – Knowledgebase (zemax.com)
I am confused about how the direction is calculated after determining the phase profile. The article says the cosine of the derivative of the phase difference is added. But that difference is not between -1 and 1 in most cases. For example, if wavelength=400, p=1, p^2 coeff = 1, the change of direction is 400/(2pi) > 1. Can someone explain where I am going wrong here?
Best answer by Jeff.Wilde
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