Hello everyone, 

I finally understood why the system was not working. This is simply because the detector viewer polarisation mode (parameter 16)  was not on. My problem now is that the software doesn’t take into account the interactions between the different polarization sources. For instance, if we select the polarization flag number 4 (for the detector rectangle) with Jx=1 for the first source and Jy=1 for the second source the interferences are still here. But in theory, 2 sources of polarization state orthogonal to each other should not produces any interference! 

So maybe I didn't set another parameter, or maybe this is just the way Zemax deals with interferences and polarization?

Can you help me with that?

Thanks a lot!

Best regards,

Marie

Ok, thank you Mark