Hi Leonid,

Getting this value from a Merit Function operand is handy. Provided you are ok to save your settings for the POP analysis feature beforehand (see the Help File about POPD).

You can use GetOperandValue, which returns the value of a Merit Function operand without needing it in the actual Merit Function Editor:

surface = 0 # Saved ending surface

wavelength = 0 # Saved wavelength

field = 0 # Saved field

data = 0 # Total fiber coupling

Total_fiber_coupling = TheSystem.MFE.GetOperandValue(ZOSAPI.Editors.MFE.MeritOperandType.POPD,

                                                     surface, wavelength, field, data, 0, 0, 0, 0)

print(Total_fiber_coupling)

Something like the above should work in a Python Interactive Extension, or Standalone Application. Change the data variable to whatever is most relevant to you.

Let me know if this works for you. Or if you need help setting up the whole POP analysis through the ZOS-API.

Take care,

David