Empirical dispersion models
| Model | modelname | Atributes |
| Cauchy formula | Cauchy | 2, exp |
| Constant | Constant | default_value |
| Sellmeier formula | Sellmeier | A, eV, number_of_terms |
| Model | modelname | Atributes |
| Cauchy formula | Cauchy | 2, exp |
| Constant | Constant | default_value |
| Sellmeier formula | Sellmeier | A, eV, number_of_terms |