Hi,

I’d like to have a sanity check for correct calculation of wavefront error in the attached design. This sequential model is for collimation of a multi-mode laser diode onto an LCOS surface and I would like to assess the wavefront error at the LCOS.

Based on what I have read in the Help PDF and in the Zemax Community & Knowledgebase, I believe that for an afocal system with collimated beam at the image plane, I should use the Absolute 2 setting for Reference OPD under System Explorer\Advanced (rather than the default Exit Pupil). This is due to the fact that the exit pupil is a long distance (>26m in this specific model) from the image plane.

Adjusting the Reference OPD setting does make a big difference to the Wavefront Map and RMS value, so I would like to be sure that I have the correct setting before performing the Wavefront Error analysis (in the attached model and other similar ones).

Thanks in advance for your help/advice.

Michael