You can’t really optimize coatings in OpticStudio, though you can vary layer thicknesses to produce the best as-placed performance. Usually you just place coatings on the surface and look at the perfromance data to select the best one. Coating selection by Substitution is not supported AFAIK.

• Mark

I agree with @Mark.Nicholson. If you really want to, you could perform the coating substitution with the ZOS-API. In pseudo-code you would:

1. Connect to your file
2. Substitute coating
3. Run optimizer
4. Store the MF value
5. Back to 2 until all coatings of interests have been tried
6. Pick the coating that leads to best MF value

I hope this helps and take care,

David