Zemax non-sequential: Filter string to distinguish different grating orders

Question

Hello,I have to do straylight analysis of a grating spectrometer.The grating diffracts into several diffraction orders.All diffraction orders other than the nominal constitute straylight (i.e. unwanted light).How can I apply a filter in the ray database that identifies paths for rays diffracted off the grating into a specific order?Filter strings “Dn” or “En” (N: srf no of diffraction grating) don’t do the trick, since there is no distinction of diffraction order.Thanks for your insights.

Mark.Nicholson · Accepted Answer

Oooh, that’s a very goodpoint Joachim! There is no direct way to do it.The only workarounds I can thinkof are:Look at the direction cosines of the diffracted ray:This shows the +and -1 diffracted raysWrite a macro that traces rays one diffraction order at a time and look at them separately.Neither is a great solution😥It would be good to implement this capability, as it would be very useful for stray light in diffractive systems, as you say. I don’t know how hard it is, but on the off-chance that a DN/O type filter could be implemented easily (diffracted at object N into order O) it would be a great addition.Mark

Sandrine Auriol · Answer

Just as a comment, this is something that our product team is actually working on.

Zemax non-sequential: Filter string to distinguish different grating orders

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