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Specify refractive index (the default): use this option to enter a value or expression for the real part of the refractive index n directly. By default the Refractive index, real part uses values From material. It is also possible to enter a User defined value or expression. Only ray propagation in isotropic media can be modeled with the Geometrical Optics interface.
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Get dispersion model from material: the dispersion model in each domain is automatically deduced from the Material nodes and their selections. This allows different optical dispersion models to be used in different domains in the geometry.
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For the built-in optical dispersion models, the wavelength is always assumed to be in units of microns (μm). For example, in the Schott (polynomial) model, the coefficients A0, A1, A2, A3, etc. have units of 1, μm, μm2, μm3, and so on. If another source were to provide these coefficients using nanometers instead of microns, then some manual conversion would be required.
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Locate the default Medium Properties node.
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From the Optical dispersion model list, select Get dispersion model from material. If the glasses loaded in step 1 also provide thermo-optic coefficients, it is important to specify an accurate value of the Temperature as well.
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None (the default): no offset will be applied.
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Schott: this is the only built-in thermo-optic dispersion model available. The coefficients used to compute a temperature dependent offset in the refractive index can either be taken From material (the default), or User defined. A reference temperature is also required. This may also be taken From material (the default), or User defined.
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