The example from the KBA How to use POP with lenslet arrays is using a lenslet array. It is defined with a user-defined surface us_array.c. So in this example, there is a pupil for the whole system so it won't trace a chief ray for a specific lenslet.

If you want to trace a chief ray for a specific lenslet, you can use vignetting factors. The vignetting factors can decenter and reshape the pupil. So you could set them up for a specific lenslet and that would then trace a chief ray for a specific lenslet.

I would recommend checking the help files about vignetting factors if you are not familiar with them.

Sandrine

Thank you Ronian for your insight on this. Yes let us know how this goes and we'll be happy to help.

Hi Atabak,

Thanks for your post here! Just to be clear here, so that I am sure that I understand your question correctly: are you asking about the proper Reference setting (either Chief Ray or Vertex) for your MLA decenter? Are both settings not quite giving you what you expect?

It's hard to say for sure without being able to look at your file, but is Surface 24 meant to be an evaluation plane rather than an optical surface? I noticed that when you set your Reference to Vertex, the beam itself looks well-centered on Surface 24. If this is a surface after your decentered cylindrical element, you should check to see if you have defined your coordinate-adjusting settings (whether it's through Coordinate Break surfaces or through the Surface Properties) to ensure that your surface after the decentered element is not moving as well (if that is what you're trying to model). For instance, in the below image, I have two configurations for a cylindrical lens, Config 1 (in blue rays) being the nominal placement, and Config 2 (in green rays) being a displaced len along the Y-axis:

Since the decenter is defined to only apply to the lens, the image surface is left unaffected. Setting the Reference to Vertex then shows the displacement of the focused beam in a way that matches up with what we see in the 3D Viewer:

 

If this doesn't answer your question, though, we may be able to provide more help if we can take a look at your file. If you can, feel free to share it on this thread here. Otherwise, you are welcome to open a support case on MyZemax at this link.

~ Angel

Hi Atabak

I followed your description and added a pair of CB around the non-sequential component surface. I created 2 configs: a nominal and a decentered one.

The issue is that in one case the chief ray can't be traced:

So that means that the reference is the same in both configs.

Sandrine