- I would like to calculate absolute value for phase. I mean unwrapped phase (not modulo 360 degrees)?
In order to calculate absolute phase (or unwrapped phase), you just need to activate "Continuous phase" option:
Synthesis --> Options --> Axis tab (Top) --> Axis tab (Bottom) --> Check "Continuous phase plots".
When you activate "Continuous Phase Plots" it will affect not only plotting. OptiLayer will try to use unwrapped phase during synthesis as well. This improves the results significantly. In this case phase targets should not have gaps in spectral dependencies. Also you may want to use "Automatic" scaling in this case, since phase will change in much wider limits.
- I know reliable dispersion of the refractive indices of our thin film materials in the visible spectral range. If I synthesize a coating for the infra-red range or in the VIS-IR spectral range, what refractive index values are used by OptiLayer in the optimization/evaluation process?
If your indices are specified by a formula (for example, Cauchy formula or Sellmeier formula), then OptiLayer will calculate refractive index values in the IR spectral range with the help of this formula. If you have dispersion tables, then OptiLayer will use in the IR range the constant values of refractive indices equal to the last values in the tables.