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NSC and Physical Optics Propagation

K

Hello,

I'm trying to simulate a system that focuses a beam with lenses after it reflects off of a DMD. I have made a rudimentary model of a DMD using NSC, but if I try to use POP I get an error message saying that the entrance pupil can't be located. I noticed that most of the posts that come up about POP show setups that are purely sequential. This might be a naive question, but is it not possible to use POP when you have non-sequential components in your system? Or is it because I have my entire system in non-sequential mode, so it doesn't take any of the lenses to be the entrance pupil?

Using the regular ray tracing method in non-sequential mode doesn't show any of the expected diffraction from the mirrors, and I don't observe a Fourier transform where I would expect.

Thanks for your help!

Katya

Best answer by Mark.Nicholson

Hey Katya,

If you're using hybrid mode NSC, make sure the stop is before the NSC group and use an 'object-specific' aperture definition like entrance pupil diameter or float-by-stop. You'll probably also need to use a plane phase reference and have pretty high sampling. Check out the sample file Documents\Zemax\Samples\Physical Optics\Lenslet Array.ZMX for an example of a similar system.

BUT

There's a little-known capability in Non-sequential that might do what you need better. Check out the sample file Samples\Non-sequential\Coherence Interference and Diffraction\Interference Example 4- Diffraction Limited Imaging.ZMX. Note the use of the Huygens Mode flag on detector object 6. This adds the rays landing on the detector as a coherent sum of plane waves to give the production of a full PSF rather than a geometric point image:

This may be the easier way of getting what you want. I recommend raeding the documentation on the Huygens Mode of the detector 😎

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Mark.Nicholson
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Hey Katya,

If you're using hybrid mode NSC, make sure the stop is before the NSC group and use an 'object-specific' aperture definition like entrance pupil diameter or float-by-stop. You'll probably also need to use a plane phase reference and have pretty high sampling. Check out the sample file Documents\Zemax\Samples\Physical Optics\Lenslet Array.ZMX for an example of a similar system.

BUT

There's a little-known capability in Non-sequential that might do what you need better. Check out the sample file Samples\Non-sequential\Coherence Interference and Diffraction\Interference Example 4- Diffraction Limited Imaging.ZMX. Note the use of the Huygens Mode flag on detector object 6. This adds the rays landing on the detector as a coherent sum of plane waves to give the production of a full PSF rather than a geometric point image:

This may be the easier way of getting what you want. I recommend raeding the documentation on the Huygens Mode of the detector 😎

Mark.Nicholson
Luminary
Forum|alt.badge.img+3

Quick follow up, check out https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01402 for a full discussion of the POP and lenslet approach. The same thing should work for POP and DMD.

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