So far, we have compared the geometrical ray trace results between sequential and non-sequential file. We can also make the comparison between diffraction calculations, specifically Huygen’s point spread function. Set the following parameters for the source and detector in the editor.

Source
# Analysis Rays: 3000 (reduced to speed up the detector trace)

Detector
Data Type: 1
PSF Wave#: 2

Also, set the Detector Viewer to coherent irradiance.



After tracing analysis rays to the detector it will display the Huygen's diffraction point spread function.



Here is what the equivalent sequential analysis looks like:



Both sequential and non-sequential analysis shows practically the same results. The small difference in the intensity of the second ring is due to the different number of rays traced.

Now that we are confident with the conversion process, we can carry on and do further modeling with the non-sequential file. You are encouraged to learn about non-sequential ray tracing in ZEMAX by reading related knowledge base articles, studying the sample files and referring to the manual (chapter 12).